31628980 has 12 divisors (see below), whose sum is σ = 66420900. Its totient is φ = 12651584.

The previous prime is 31628957. The next prime is 31629001. The reversal of 31628980 is 8982613.

It can be written as a sum of positive squares in 2 ways, for example, as 7540516 + 24088464 = 2746^2 + 4908^2 .

It is a congruent number.

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, 790705 + ... + 790744.

It is an arithmetic number, because the mean of its divisors is an integer number (5535075).

Almost surely, 2^31628980 is an apocalyptic number.

It is an amenable number.

31628980 is an abundant number, since it is smaller than the sum of its proper divisors (34791920).

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

31628980 is a wasteful number, since it uses less digits than its factorization.

31628980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581458 (or 1581456 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 31628980 is about 5623.9647936309. The cubic root of 31628980 is about 316.2484426592.

The spelling of 31628980 in words is "thirty-one million, six hundred twenty-eight thousand, nine hundred eighty".