31909610928 has 80 divisors (see below), whose sum is σ = 91637912576. Its totient is φ = 9501615360.

The previous prime is 31909610923. The next prime is 31909610983. The reversal of 31909610928 is 82901690913.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (31909610921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 805450 + ... + 844137.

Almost surely, 2^31909610928 is an apocalyptic number.

It is an amenable number.

31909610928 is an abundant number, since it is smaller than the sum of its proper divisors (59728301648).

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

31909610928 is a wasteful number, since it uses less digits than its factorization.

31909610928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649642 (or 1649636 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 48.

The spelling of 31909610928 in words is "thirty-one billion, nine hundred nine million, six hundred ten thousand, nine hundred twenty-eight".