31713520 has 40 divisors (see below), whose sum is σ = 74008656. Its totient is φ = 12638208.

The previous prime is 31713491. The next prime is 31713533. The reversal of 31713520 is 2531713.

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

It is a junction number, because it is equal to n+sod(n) for n = 31713491 and 31713500.

It is a congruent number.

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, 27679 + ... + 28801.

Almost surely, 2^31713520 is an apocalyptic number.

It is an amenable number.

31713520 is an abundant number, since it is smaller than the sum of its proper divisors (42295136).

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

31713520 is a wasteful number, since it uses less digits than its factorization.

31713520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489 (or 1483 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 31713520 is about 5631.4758278803. The cubic root of 31713520 is about 316.5299551455.

The spelling of 31713520 in words is "thirty-one million, seven hundred thirteen thousand, five hundred twenty".