31213028 has 24 divisors (see below), whose sum is σ = 68101824. Its totient is φ = 12160800.

The previous prime is 31213027. The next prime is 31213043. The reversal of 31213028 is 82031213.

It is not an unprimeable number, because it can be changed into a prime (31213027) 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 7 ways as a sum of consecutive naturals, for example, 50363 + ... + 50978.

It is an arithmetic number, because the mean of its divisors is an integer number (2837576).

Almost surely, 2^31213028 is an apocalyptic number.

It is an amenable number.

31213028 is an abundant number, since it is smaller than the sum of its proper divisors (36888796).

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

31213028 is a wasteful number, since it uses less digits than its factorization.

31213028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101363 (or 101361 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 31213028 is about 5586.8620888653. The cubic root of 31213028 is about 314.8559953177.

The spelling of 31213028 in words is "thirty-one million, two hundred thirteen thousand, twenty-eight".