31728746 has 32 divisors (see below), whose sum is σ = 57870720. Its totient is φ = 12744000.

The previous prime is 31728679. The next prime is 31728769. The reversal of 31728746 is 64782713.

It is a Harshad number since it is a multiple of its sum of digits (38).

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 15 ways as a sum of consecutive naturals, for example, 26276 + ... + 27456.

It is an arithmetic number, because the mean of its divisors is an integer number (1808460).

Almost surely, 2^31728746 is an apocalyptic number.

31728746 is a deficient number, since it is larger than the sum of its proper divisors (26141974).

31728746 is a wasteful number, since it uses less digits than its factorization.

31728746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310.

The product of its digits is 56448, while the sum is 38.

The square root of 31728746 is about 5632.8275315333. The cubic root of 31728746 is about 316.5806035126.

The spelling of 31728746 in words is "thirty-one million, seven hundred twenty-eight thousand, seven hundred forty-six".