31373393928 has 16 divisors (see below), whose sum is σ = 78433484880. Its totient is φ = 10457797968.

The previous prime is 31373393917. The next prime is 31373393939. The reversal of 31373393928 is 82939337313.

It is an interprime number because it is at equal distance from previous prime (31373393917) and next prime (31373393939).

It is a super-2 number, since 2×31373393928² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653612350 + ... + 653612397.

It is an arithmetic number, because the mean of its divisors is an integer number (4902092805).

Almost surely, 2^31373393928 is an apocalyptic number.

It is an amenable number.

31373393928 is an abundant number, since it is smaller than the sum of its proper divisors (47060090952).

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

31373393928 is a wasteful number, since it uses less digits than its factorization.

31373393928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307224756 (or 1307224752 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 51.

The spelling of 31373393928 in words is "thirty-one billion, three hundred seventy-three million, three hundred ninety-three thousand, nine hundred twenty-eight".