31290549928 has 32 divisors (see below), whose sum is σ = 67768306560. Its totient is φ = 13386330880.

The previous prime is 31290549853. The next prime is 31290549937. The reversal of 31290549928 is 82994509213.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10456576 + ... + 10459567.

It is an arithmetic number, because the mean of its divisors is an integer number (2117759580).

Almost surely, 2^31290549928 is an apocalyptic number.

It is an amenable number.

31290549928 is an abundant number, since it is smaller than the sum of its proper divisors (36477756632).

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

31290549928 is a wasteful number, since it uses less digits than its factorization.

31290549928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20916177 (or 20916173 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 31290549928 in words is "thirty-one billion, two hundred ninety million, five hundred forty-nine thousand, nine hundred twenty-eight".