31663680 has 56 divisors (see below), whose sum is σ = 100535232. Its totient is φ = 8443392.

The previous prime is 31663669. The next prime is 31663691. The reversal of 31663680 is 8636613.

It is an interprime number because it is at equal distance from previous prime (31663669) and next prime (31663691).

It is a super-2 number, since 2×31663680² = 2005177262284800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15532 + ... + 17451.

It is an arithmetic number, because the mean of its divisors is an integer number (1795272).

Almost surely, 2^31663680 is an apocalyptic number.

31663680 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31663680 is an abundant number, since it is smaller than the sum of its proper divisors (68871552).

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

31663680 is a wasteful number, since it uses less digits than its factorization.

31663680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33003 (or 32993 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 31663680 is about 5627.0489601566. The cubic root of 31663680 is about 316.3640519338.

The spelling of 31663680 in words is "thirty-one million, six hundred sixty-three thousand, six hundred eighty".