31377680 has 20 divisors (see below), whose sum is σ = 72953292. Its totient is φ = 12551040.

The previous prime is 31377667. The next prime is 31377719. The reversal of 31377680 is 8677313.

It can be written as a sum of positive squares in 2 ways, for example, as 5326864 + 26050816 = 2308^2 + 5104^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 31377680.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196031 + ... + 196190.

Almost surely, 2^31377680 is an apocalyptic number.

It is an amenable number.

31377680 is an abundant number, since it is smaller than the sum of its proper divisors (41575612).

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

31377680 is a wasteful number, since it uses less digits than its factorization.

31377680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392234 (or 392228 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 31377680 is about 5601.5783490013. The cubic root of 31377680 is about 315.4086574817.

The spelling of 31377680 in words is "thirty-one million, three hundred seventy-seven thousand, six hundred eighty".