by Danny Roth
Published: 25 September 2016 (link)
George and Martha’s bank account number is an 8-digit number consisting of the digits 1 to 8 in some order. Martha commented that, if you split the number into two 4-figure numbers, then the number formed by the last four digits is a multiple of the number formed by the first four digits. Then George listed all the different prime numbers that divided exactly into the account number. When he added together all those primes the total was less than a hundred.
What is their account number?