31838778028 has 24 divisors (see below), whose sum is σ = 56155187088. Its totient is φ = 15794923776.

The previous prime is 31838778019. The next prime is 31838778047. The reversal of 31838778028 is 82087783813.

It is a self number, because there is not a number n which added to its sum of digits gives 31838778028.

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, 203400 + ... + 324112.

It is an arithmetic number, because the mean of its divisors is an integer number (2339799462).

Almost surely, 2^31838778028 is an apocalyptic number.

It is an amenable number.

31838778028 is a deficient number, since it is larger than the sum of its proper divisors (24316409060).

31838778028 is a wasteful number, since it uses less digits than its factorization.

31838778028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121233 (or 121231 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 55.

The spelling of 31838778028 in words is "thirty-one billion, eight hundred thirty-eight million, seven hundred seventy-eight thousand, twenty-eight".