31283980 has 48 divisors (see below), whose sum is σ = 80861760. Its totient is φ = 9900288.

The previous prime is 31283971. The next prime is 31284017. The reversal of 31283980 is 8938213.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6775 + ... + 10414.

It is an arithmetic number, because the mean of its divisors is an integer number (1684620).

Almost surely, 2^31283980 is an apocalyptic number.

It is an amenable number.

31283980 is an abundant number, since it is smaller than the sum of its proper divisors (49577780).

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

31283980 is a wasteful number, since it uses less digits than its factorization.

31283980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17218 (or 17216 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 31283980 is about 5593.2083816000. The cubic root of 31283980 is about 315.0943867650.

The spelling of 31283980 in words is "thirty-one million, two hundred eighty-three thousand, nine hundred eighty".