31679636 has 24 divisors (see below), whose sum is σ = 58905000. Its totient is φ = 14856192.

The previous prime is 31679633. The next prime is 31679657. The reversal of 31679636 is 63697613.

It can be written as a sum of positive squares in 4 ways, for example, as 7728400 + 23951236 = 2780^2 + 4894^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 31679593 and 31679602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31679633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24740 + ... + 25988.

It is an arithmetic number, because the mean of its divisors is an integer number (2454375).

Almost surely, 2^31679636 is an apocalyptic number.

It is an amenable number.

31679636 is a deficient number, since it is larger than the sum of its proper divisors (27225364).

31679636 is a wasteful number, since it uses less digits than its factorization.

31679636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643 (or 1641 counting only the distinct ones).

The product of its digits is 122472, while the sum is 41.

The square root of 31679636 is about 5628.4665762533. The cubic root of 31679636 is about 316.4171838622.

The spelling of 31679636 in words is "thirty-one million, six hundred seventy-nine thousand, six hundred thirty-six".