31161628 has 6 divisors (see below), whose sum is σ = 54532856. Its totient is φ = 15580812.

The previous prime is 31161607. The next prime is 31161643. The reversal of 31161628 is 82616113.

It is a super-2 number, since 2×31161628² = 1942094119220768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31161596 and 31161605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3895200 + ... + 3895207.

Almost surely, 2^31161628 is an apocalyptic number.

It is an amenable number.

31161628 is a deficient number, since it is larger than the sum of its proper divisors (23371228).

31161628 is a wasteful number, since it uses less digits than its factorization.

31161628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7790411 (or 7790409 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 31161628 is about 5582.2601157596. The cubic root of 31161628 is about 314.6830708396.

The spelling of 31161628 in words is "thirty-one million, one hundred sixty-one thousand, six hundred twenty-eight".