31909297772 has 48 divisors (see below), whose sum is σ = 64546608672. Its totient is φ = 13641415680.

The previous prime is 31909297709. The next prime is 31909297829. The reversal of 31909297772 is 27779290913.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1102478 + ... + 1131050.

It is an arithmetic number, because the mean of its divisors is an integer number (1344721014).

Almost surely, 2^31909297772 is an apocalyptic number.

It is an amenable number.

31909297772 is an abundant number, since it is smaller than the sum of its proper divisors (32637310900).

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

31909297772 is a wasteful number, since it uses less digits than its factorization.

31909297772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30098 (or 30096 counting only the distinct ones).

The product of its (nonzero) digits is 3000564, while the sum is 56.

The spelling of 31909297772 in words is "thirty-one billion, nine hundred nine million, two hundred ninety-seven thousand, seven hundred seventy-two".