31368636 has 72 divisors (see below), whose sum is σ = 86397584. Its totient is φ = 9538560.

The previous prime is 31368613. The next prime is 31368641. The reversal of 31368636 is 63686313.

31368636 is a `hidden beast` number, since 3 + 13 + 6 + 8 + 636 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 31368636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45051 + ... + 45741.

Almost surely, 2^31368636 is an apocalyptic number.

31368636 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31368636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43198792).

31368636 is an abundant number, since it is smaller than the sum of its proper divisors (55028948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31368636 is a wasteful number, since it uses less digits than its factorization.

31368636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811 (or 806 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 31368636 is about 5600.7710183510. The cubic root of 31368636 is about 315.3783511195.

The spelling of 31368636 in words is "thirty-one million, three hundred sixty-eight thousand, six hundred thirty-six".