30500720 has 80 divisors (see below), whose sum is σ = 77057568. Its totient is φ = 11182080.

The previous prime is 30500693. The next prime is 30500741. The reversal of 30500720 is 2700503.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55487 + ... + 56033.

Almost surely, 2^30500720 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 30500720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38528784).

30500720 is an abundant number, since it is smaller than the sum of its proper divisors (46556848).

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

30500720 is a wasteful number, since it uses less digits than its factorization.

30500720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 17.

The square root of 30500720 is about 5522.7456939461. The cubic root of 30500720 is about 312.4424470011.

The spelling of 30500720 in words is "thirty million, five hundred thousand, seven hundred twenty".