31668880 has 40 divisors (see below), whose sum is σ = 73870272. Its totient is φ = 12626304.

The previous prime is 31668869. The next prime is 31668881. The reversal of 31668880 is 8886613.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (31668881) 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, 39847 + ... + 40633.

Almost surely, 2^31668880 is an apocalyptic number.

It is an amenable number.

31668880 is an abundant number, since it is smaller than the sum of its proper divisors (42201392).

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

31668880 is a wasteful number, since it uses less digits than its factorization.

31668880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303 (or 1297 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 31668880 is about 5627.5109951025. The cubic root of 31668880 is about 316.3813693884.

It can be divided in two parts, 316 and 68880, that added together give a palindrome (69196).

The spelling of 31668880 in words is "thirty-one million, six hundred sixty-eight thousand, eight hundred eighty".