30713520 has 40 divisors (see below), whose sum is σ = 95212656. Its totient is φ = 8190208.

The previous prime is 30713477. The next prime is 30713521. The reversal of 30713520 is 2531703.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (30713521) 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, 63747 + ... + 64226.

Almost surely, 2^30713520 is an apocalyptic number.

30713520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30713520 is an abundant number, since it is smaller than the sum of its proper divisors (64499136).

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

30713520 is a wasteful number, since it uses less digits than its factorization.

30713520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127989 (or 127983 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 30713520 is about 5541.9779862428. The cubic root of 30713520 is about 313.1673886145.

The spelling of 30713520 in words is "thirty million, seven hundred thirteen thousand, five hundred twenty".