31065980 has 24 divisors (see below), whose sum is σ = 71169840. Its totient is φ = 11296640.

The previous prime is 31065973. The next prime is 31065997. The reversal of 31065980 is 8956013.

It is a super-2 number, since 2×31065980² = 1930190226720800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70385 + ... + 70824.

It is an arithmetic number, because the mean of its divisors is an integer number (2965410).

Almost surely, 2^31065980 is an apocalyptic number.

It is an amenable number.

31065980 is an abundant number, since it is smaller than the sum of its proper divisors (40103860).

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

31065980 is a wasteful number, since it uses less digits than its factorization.

31065980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141229 (or 141227 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 31065980 is about 5573.6863923260. The cubic root of 31065980 is about 314.3607764435.

The spelling of 31065980 in words is "thirty-one million, sixty-five thousand, nine hundred eighty".