31699139780 has 72 divisors (see below), whose sum is σ = 84476177856. Its totient is φ = 9880248000.

The previous prime is 31699139749. The next prime is 31699139809. The reversal of 31699139780 is 8793199613.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1459496 + ... + 1481055.

It is an arithmetic number, because the mean of its divisors is an integer number (1173280248).

Almost surely, 2^31699139780 is an apocalyptic number.

It is an amenable number.

31699139780 is an abundant number, since it is smaller than the sum of its proper divisors (52777038076).

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

31699139780 is a wasteful number, since it uses less digits than its factorization.

31699139780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2940585 (or 2940576 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 56.

The spelling of 31699139780 in words is "thirty-one billion, six hundred ninety-nine million, one hundred thirty-nine thousand, seven hundred eighty".