31928890 has 48 divisors (see below), whose sum is σ = 70806312. Its totient is φ = 10300416.

The previous prime is 31928881. The next prime is 31928927. The reversal of 31928890 is 9882913.

It can be written as a sum of positive squares in 4 ways, for example, as 25472209 + 6456681 = 5047^2 + 2541^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6414 + ... + 10246.

Almost surely, 2^31928890 is an apocalyptic number.

31928890 is an abundant number, since it is smaller than the sum of its proper divisors (38877422).

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

31928890 is a wasteful number, since it uses less digits than its factorization.

31928890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3871 (or 3864 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 31928890 is about 5650.5654584298. The cubic root of 31928890 is about 317.2448691316.

The spelling of 31928890 in words is "thirty-one million, nine hundred twenty-eight thousand, eight hundred ninety".