31638379968 has 84 divisors (see below), whose sum is σ = 97661550168. Its totient is φ = 9734883840.

The previous prime is 31638379961. The next prime is 31638379973. The reversal of 31638379968 is 86997383613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31638379961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2105118 + ... + 2120093.

It is an arithmetic number, because the mean of its divisors is an integer number (1162637502).

Almost surely, 2^31638379968 is an apocalyptic number.

It is an amenable number.

31638379968 is an abundant number, since it is smaller than the sum of its proper divisors (66023170200).

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

31638379968 is a wasteful number, since it uses less digits than its factorization.

31638379968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4225242 (or 4225229 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 63.

The spelling of 31638379968 in words is "thirty-one billion, six hundred thirty-eight million, three hundred seventy-nine thousand, nine hundred sixty-eight".