31257612 has 18 divisors (see below), whose sum is σ = 79012388. Its totient is φ = 10419192.

The previous prime is 31257607. The next prime is 31257613. The reversal of 31257612 is 21675213.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (31257613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 434098 + ... + 434169.

Almost surely, 2^31257612 is an apocalyptic number.

It is an amenable number.

31257612 is an abundant number, since it is smaller than the sum of its proper divisors (47754776).

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

31257612 is a wasteful number, since it uses less digits than its factorization.

31257612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868277 (or 868272 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 31257612 is about 5590.8507402720. The cubic root of 31257612 is about 315.0058351149.

The spelling of 31257612 in words is "thirty-one million, two hundred fifty-seven thousand, six hundred twelve".