31928897 has 32 divisors (see below), whose sum is σ = 43352064. Its totient is φ = 22708800.

The previous prime is 31928881. The next prime is 31928927. The reversal of 31928897 is 79882913.

It is a cyclic number.

It is not a de Polignac number, because 31928897 - 2⁴ = 31928881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31928857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167072 + ... + 167262.

It is an arithmetic number, because the mean of its divisors is an integer number (1354752).

Almost surely, 2^31928897 is an apocalyptic number.

It is an amenable number.

31928897 is a deficient number, since it is larger than the sum of its proper divisors (11423167).

31928897 is a wasteful number, since it uses less digits than its factorization.

31928897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389.

The product of its digits is 217728, while the sum is 47.

The square root of 31928897 is about 5650.5660778368. The cubic root of 31928897 is about 317.2448923156.

The spelling of 31928897 in words is "thirty-one million, nine hundred twenty-eight thousand, eight hundred ninety-seven".