30752720 has 40 divisors (see below), whose sum is σ = 72859176. Its totient is φ = 12067328.

The previous prime is 30752717. The next prime is 30752753. The reversal of 30752720 is 2725703.

It can be written as a sum of positive squares in 4 ways, for example, as 8549776 + 22202944 = 2924^2 + 4712^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 30752720.

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, 614 + ... + 7866.

Almost surely, 2^30752720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30752720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36429588).

30752720 is an abundant number, since it is smaller than the sum of its proper divisors (42106456).

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

30752720 is a wasteful number, since it uses less digits than its factorization.

30752720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7319 (or 7313 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 26.

The square root of 30752720 is about 5545.5135019221. The cubic root of 30752720 is about 313.3005649551.

The spelling of 30752720 in words is "thirty million, seven hundred fifty-two thousand, seven hundred twenty".