31730164 has 24 divisors (see below), whose sum is σ = 57312360. Its totient is φ = 15359616.

The previous prime is 31730137. The next prime is 31730197. The reversal of 31730164 is 46103713.

It can be written as a sum of positive squares in 4 ways, for example, as 3724900 + 28005264 = 1930^2 + 5292^2 .

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 7 ways as a sum of consecutive naturals, for example, 39414 + ... + 40210.

It is an arithmetic number, because the mean of its divisors is an integer number (2388015).

Almost surely, 2^31730164 is an apocalyptic number.

It is an amenable number.

31730164 is a deficient number, since it is larger than the sum of its proper divisors (25582196).

31730164 is a wasteful number, since it uses less digits than its factorization.

31730164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 31730164 is about 5632.9533994167. The cubic root of 31730164 is about 316.5853195789.

Adding to 31730164 its reverse (46103713), we get a palindrome (77833877).

The spelling of 31730164 in words is "thirty-one million, seven hundred thirty thousand, one hundred sixty-four".