31656642 has 16 divisors (see below), whose sum is σ = 65356032. Its totient is φ = 10211760.

The previous prime is 31656623. The next prime is 31656659. The reversal of 31656642 is 24665613.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84913 + ... + 85284.

It is an arithmetic number, because the mean of its divisors is an integer number (4084752).

Almost surely, 2^31656642 is an apocalyptic number.

31656642 is an abundant number, since it is smaller than the sum of its proper divisors (33699390).

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

31656642 is a wasteful number, since it uses less digits than its factorization.

31656642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170233.

The product of its digits is 25920, while the sum is 33.

The square root of 31656642 is about 5626.4235531997. The cubic root of 31656642 is about 316.3406104051.

The spelling of 31656642 in words is "thirty-one million, six hundred fifty-six thousand, six hundred forty-two".