31663896 has 128 divisors (see below), whose sum is σ = 92067840. Its totient is φ = 8985600.

The previous prime is 31663889. The next prime is 31663909. The reversal of 31663896 is 69836613.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 433716 + ... + 433788.

It is an arithmetic number, because the mean of its divisors is an integer number (719280).

Almost surely, 2^31663896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31663896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46033920).

31663896 is an abundant number, since it is smaller than the sum of its proper divisors (60403944).

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

31663896 is a wasteful number, since it uses less digits than its factorization.

31663896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 173 counting only the distinct ones).

The product of its digits is 139968, while the sum is 42.

The square root of 31663896 is about 5627.0681531327. The cubic root of 31663896 is about 316.3647713119.

The spelling of 31663896 in words is "thirty-one million, six hundred sixty-three thousand, eight hundred ninety-six".