31998479880 has 64 divisors (see below), whose sum is σ = 101047838400. Its totient is φ = 8083825920.

The previous prime is 31998479839. The next prime is 31998479917. The reversal of 31998479880 is 8897489913.

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, 7014931 + ... + 7019490.

It is an arithmetic number, because the mean of its divisors is an integer number (1578872475).

Almost surely, 2^31998479880 is an apocalyptic number.

31998479880 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31998479880 is an abundant number, since it is smaller than the sum of its proper divisors (69049358520).

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

31998479880 is a wasteful number, since it uses less digits than its factorization.

31998479880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14034454 (or 14034450 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 66.

The spelling of 31998479880 in words is "thirty-one billion, nine hundred ninety-eight million, four hundred seventy-nine thousand, eight hundred eighty".