31628997 has 12 divisors (see below), whose sum is σ = 45770400. Its totient is φ = 21047208.

The previous prime is 31628957. The next prime is 31629001. The reversal of 31628997 is 79982613.

It is not a de Polignac number, because 31628997 - 2⁷ = 31628869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31628957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2458 + ... + 8324.

It is an arithmetic number, because the mean of its divisors is an integer number (3814200).

Almost surely, 2^31628997 is an apocalyptic number.

It is an amenable number.

31628997 is a deficient number, since it is larger than the sum of its proper divisors (14141403).

31628997 is a wasteful number, since it uses less digits than its factorization.

31628997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6472 (or 6469 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 31628997 is about 5623.9663050200. The cubic root of 31628997 is about 316.2484993185.

The spelling of 31628997 in words is "thirty-one million, six hundred twenty-eight thousand, nine hundred ninety-seven".