30004720 has 20 divisors (see below), whose sum is σ = 69761160. Its totient is φ = 12001856.

The previous prime is 30004717. The next prime is 30004729. The reversal of 30004720 is 2740003.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 30004694 and 30004703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30004729) 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, 187450 + ... + 187609.

It is an arithmetic number, because the mean of its divisors is an integer number (3488058).

Almost surely, 2^30004720 is an apocalyptic number.

It is an amenable number.

30004720 is an abundant number, since it is smaller than the sum of its proper divisors (39756440).

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

30004720 is a wasteful number, since it uses less digits than its factorization.

30004720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375072 (or 375066 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 16.

The square root of 30004720 is about 5477.6564331838. The cubic root of 30004720 is about 310.7395454491.

Adding to 30004720 its reverse (2740003), we get a palindrome (32744723).

The spelling of 30004720 in words is "thirty million, four thousand, seven hundred twenty".