30720320 has 28 divisors (see below), whose sum is σ = 73153524. Its totient is φ = 12288000.

The previous prime is 30720307. The next prime is 30720331. The reversal of 30720320 is 2302703.

It can be written as a sum of positive squares in 2 ways, for example, as 7139584 + 23580736 = 2672^2 + 4856^2 .

It is a congruent number.

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, 47681 + ... + 48320.

Almost surely, 2^30720320 is an apocalyptic number.

It is an amenable number.

30720320 is an abundant number, since it is smaller than the sum of its proper divisors (42433204).

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

30720320 is an equidigital number, since it uses as much as digits as its factorization.

30720320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96018 (or 96008 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 17.

The square root of 30720320 is about 5542.5914516587. The cubic root of 30720320 is about 313.1904987530.

The spelling of 30720320 in words is "thirty million, seven hundred twenty thousand, three hundred twenty".