31638869660 has 24 divisors (see below), whose sum is σ = 70349958000. Its totient is φ = 11911103744.

The previous prime is 31638869657. The next prime is 31638869671. The reversal of 31638869660 is 6696883613.

It is a junction number, because it is equal to n+sod(n) for n = 31638869596 and 31638869605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46527410 + ... + 46528089.

It is an arithmetic number, because the mean of its divisors is an integer number (2931248250).

Almost surely, 2^31638869660 is an apocalyptic number.

It is an amenable number.

31638869660 is an abundant number, since it is smaller than the sum of its proper divisors (38711088340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31638869660 is a wasteful number, since it uses less digits than its factorization.

31638869660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93055525 (or 93055523 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 56.

The spelling of 31638869660 in words is "thirty-one billion, six hundred thirty-eight million, eight hundred sixty-nine thousand, six hundred sixty".