31312072 has 16 divisors (see below), whose sum is σ = 64047600. Its totient is φ = 14232720.

The previous prime is 31312051. The next prime is 31312081. The reversal of 31312072 is 27021313.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 177822 + ... + 177997.

It is an arithmetic number, because the mean of its divisors is an integer number (4002975).

Almost surely, 2^31312072 is an apocalyptic number.

It is an amenable number.

31312072 is an abundant number, since it is smaller than the sum of its proper divisors (32735528).

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

31312072 is a wasteful number, since it uses less digits than its factorization.

31312072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355836 (or 355832 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 31312072 is about 5595.7190780095. The cubic root of 31312072 is about 315.1886733972.

Adding to 31312072 its reverse (27021313), we get a palindrome (58333385).

The spelling of 31312072 in words is "thirty-one million, three hundred twelve thousand, seventy-two".