31228872 has 32 divisors (see below), whose sum is σ = 79548480. Its totient is φ = 10212800.

The previous prime is 31228867. The next prime is 31228903. The reversal of 31228872 is 27882213.

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, 11004 + ... + 13547.

It is an arithmetic number, because the mean of its divisors is an integer number (2485890).

Almost surely, 2^31228872 is an apocalyptic number.

It is an amenable number.

31228872 is an abundant number, since it is smaller than the sum of its proper divisors (48319608).

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

31228872 is a wasteful number, since it uses less digits than its factorization.

31228872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24613 (or 24609 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 31228872 is about 5588.2798784599. The cubic root of 31228872 is about 314.9092608382.

The spelling of 31228872 in words is "thirty-one million, two hundred twenty-eight thousand, eight hundred seventy-two".