30720532 has 12 divisors (see below), whose sum is σ = 53815636. Its totient is φ = 15344640.

The previous prime is 30720527. The next prime is 30720539. The reversal of 30720532 is 23502703.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26894596 + 3825936 = 5186^2 + 1956^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30720539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1282 + ... + 7942.

Almost surely, 2^30720532 is an apocalyptic number.

It is an amenable number.

30720532 is a deficient number, since it is larger than the sum of its proper divisors (23095104).

30720532 is a wasteful number, since it uses less digits than its factorization.

30720532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7818 (or 7816 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 22.

The square root of 30720532 is about 5542.6105762538. The cubic root of 30720532 is about 313.1912191907.

The spelling of 30720532 in words is "thirty million, seven hundred twenty thousand, five hundred thirty-two".