31729144 has 16 divisors (see below), whose sum is σ = 62079120. Its totient is φ = 15174720.

The previous prime is 31729133. The next prime is 31729163. The reversal of 31729144 is 44192713.

It is a congruent number.

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, 86037 + ... + 86404.

It is an arithmetic number, because the mean of its divisors is an integer number (3879945).

Almost surely, 2^31729144 is an apocalyptic number.

It is an amenable number.

31729144 is a deficient number, since it is larger than the sum of its proper divisors (30349976).

31729144 is a wasteful number, since it uses less digits than its factorization.

31729144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172470 (or 172466 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 31729144 is about 5632.8628600384. The cubic root of 31729144 is about 316.5819272182.

The spelling of 31729144 in words is "thirty-one million, seven hundred twenty-nine thousand, one hundred forty-four".