31209696672 has 96 divisors (see below), whose sum is σ = 102140849664. Its totient is φ = 8106412800.

The previous prime is 31209696607. The next prime is 31209696677. The reversal of 31209696672 is 27669690213.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (31209696677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2103654 + ... + 2118437.

It is an arithmetic number, because the mean of its divisors is an integer number (1063967184).

Almost surely, 2^31209696672 is an apocalyptic number.

31209696672 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31209696672 is an abundant number, since it is smaller than the sum of its proper divisors (70931152992).

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

31209696672 is a wasteful number, since it uses less digits than its factorization.

31209696672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4222122 (or 4222114 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 51.

The spelling of 31209696672 in words is "thirty-one billion, two hundred nine million, six hundred ninety-six thousand, six hundred seventy-two".