31917703128 has 64 divisors (see below), whose sum is σ = 84014112000. Its totient is φ = 10076856192.

The previous prime is 31917703091. The next prime is 31917703141. The reversal of 31917703128 is 82130771913.

It is a self number, because there is not a number n which added to its sum of digits gives 31917703128.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3492501 + ... + 3501627.

It is an arithmetic number, because the mean of its divisors is an integer number (1312720500).

Almost surely, 2^31917703128 is an apocalyptic number.

31917703128 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

31917703128 is an abundant number, since it is smaller than the sum of its proper divisors (52096408872).

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

31917703128 is a wasteful number, since it uses less digits than its factorization.

31917703128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16824 (or 16820 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 42.

The spelling of 31917703128 in words is "thirty-one billion, nine hundred seventeen million, seven hundred three thousand, one hundred twenty-eight".