31249664 has 18 divisors (see below), whose sum is σ = 62377770. Its totient is φ = 15624704.

The previous prime is 31249637. The next prime is 31249679. The reversal of 31249664 is 46694213.

It can be written as a sum of positive squares in only one way, i.e., 17707264 + 13542400 = 4208^2 + 3680^2 .

It is a super-2 number, since 2×31249664² = 1953083000225792, which contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 60779 + ... + 61290.

Almost surely, 2^31249664 is an apocalyptic number.

It is an amenable number.

31249664 is a deficient number, since it is larger than the sum of its proper divisors (31128106).

31249664 is an equidigital number, since it uses as much as digits as its factorization.

31249664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122085 (or 122071 counting only the distinct ones).

The product of its digits is 31104, while the sum is 35.

The square root of 31249664 is about 5590.1398909151. The cubic root of 31249664 is about 314.9791335804.

It can be divided in two parts, 31249 and 664, that added together give a palindrome (31913).

The spelling of 31249664 in words is "thirty-one million, two hundred forty-nine thousand, six hundred sixty-four".