31631796 has 72 divisors (see below), whose sum is σ = 94785600. Its totient is φ = 9035712.

The previous prime is 31631791. The next prime is 31631801. The reversal of 31631796 is 69713613.

It is an interprime number because it is at equal distance from previous prime (31631791) and next prime (31631801).

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

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 31631796.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31631791) 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 23 ways as a sum of consecutive naturals, for example, 4480 + ... + 9128.

Almost surely, 2^31631796 is an apocalyptic number.

31631796 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 31631796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47392800).

31631796 is an abundant number, since it is smaller than the sum of its proper divisors (63153804).

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

31631796 is a wasteful number, since it uses less digits than its factorization.

31631796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4675 (or 4661 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 31631796 is about 5624.2151452447. The cubic root of 31631796 is about 316.2578278200.

The spelling of 31631796 in words is "thirty-one million, six hundred thirty-one thousand, seven hundred ninety-six".