31320680 has 32 divisors (see below), whose sum is σ = 70635240. Its totient is φ = 12499200.

The previous prime is 31320677. The next prime is 31320697. The reversal of 31320680 is 8602313.

It can be written as a sum of positive squares in 4 ways, for example, as 22829284 + 8491396 = 4778^2 + 2914^2 .

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, 27482 + ... + 28598.

Almost surely, 2^31320680 is an apocalyptic number.

It is an amenable number.

31320680 is an abundant number, since it is smaller than the sum of its proper divisors (39314560).

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

31320680 is a wasteful number, since it uses less digits than its factorization.

31320680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829 (or 1825 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 31320680 is about 5596.4881845672. The cubic root of 31320680 is about 315.2175535845.

Adding to 31320680 its reverse (8602313), we get a palindrome (39922993).

The spelling of 31320680 in words is "thirty-one million, three hundred twenty thousand, six hundred eighty".