31388890444 has 24 divisors (see below), whose sum is σ = 55370323008. Its totient is φ = 15569297280.

The previous prime is 31388890439. The next prime is 31388890447. The reversal of 31388890444 is 44409888313.

It is a junction number, because it is equal to n+sod(n) for n = 31388890391 and 31388890400.

It is not an unprimeable number, because it can be changed into a prime (31388890447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190434 + ... + 314710.

It is an arithmetic number, because the mean of its divisors is an integer number (2307096792).

Almost surely, 2^31388890444 is an apocalyptic number.

It is an amenable number.

31388890444 is a deficient number, since it is larger than the sum of its proper divisors (23981432564).

31388890444 is a wasteful number, since it uses less digits than its factorization.

31388890444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124785 (or 124783 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 52.

The spelling of 31388890444 in words is "thirty-one billion, three hundred eighty-eight million, eight hundred ninety thousand, four hundred forty-four".