31688612 has 12 divisors (see below), whose sum is σ = 58717260. Its totient is φ = 14912256.

The previous prime is 31688611. The next prime is 31688617. The reversal of 31688612 is 21688613.

It can be written as a sum of positive squares in 2 ways, for example, as 17505856 + 14182756 = 4184^2 + 3766^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31688611) by changing a digit.

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, 232937 + ... + 233072.

It is an arithmetic number, because the mean of its divisors is an integer number (4893105).

Almost surely, 2^31688612 is an apocalyptic number.

It is an amenable number.

31688612 is a deficient number, since it is larger than the sum of its proper divisors (27028648).

31688612 is a wasteful number, since it uses less digits than its factorization.

31688612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466030 (or 466028 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 31688612 is about 5629.2638950399. The cubic root of 31688612 is about 316.4470652287.

Subtracting from 31688612 its reverse (21688613), we obtain a palindrome (9999999).

The spelling of 31688612 in words is "thirty-one million, six hundred eighty-eight thousand, six hundred twelve".