31808680 has 16 divisors (see below), whose sum is σ = 71569620. Its totient is φ = 12723456.

The previous prime is 31808677. The next prime is 31808681. The reversal of 31808680 is 8680813.

It can be written as a sum of positive squares in 2 ways, for example, as 31203396 + 605284 = 5586^2 + 778^2 .

It is not an unprimeable number, because it can be changed into a prime (31808681) 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 3 ways as a sum of consecutive naturals, for example, 397569 + ... + 397648.

Almost surely, 2^31808680 is an apocalyptic number.

It is an amenable number.

31808680 is an abundant number, since it is smaller than the sum of its proper divisors (39760940).

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

31808680 is a wasteful number, since it uses less digits than its factorization.

31808680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795228 (or 795224 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 31808680 is about 5639.9184391266. The cubic root of 31808680 is about 316.8462336445.

The spelling of 31808680 in words is "thirty-one million, eight hundred eight thousand, six hundred eighty".