30724820 has 24 divisors (see below), whose sum is σ = 73739904. Its totient is φ = 10534176.

The previous prime is 30724819. The next prime is 30724823. The reversal of 30724820 is 2842703.

It is a self number, because there is not a number n which added to its sum of digits gives 30724820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30724823) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 109592 + ... + 109871.

It is an arithmetic number, because the mean of its divisors is an integer number (3072496).

Almost surely, 2^30724820 is an apocalyptic number.

It is an amenable number.

30724820 is an abundant number, since it is smaller than the sum of its proper divisors (43015084).

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

30724820 is a wasteful number, since it uses less digits than its factorization.

30724820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219479 (or 219477 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 30724820 is about 5542.9973840874. The cubic root of 30724820 is about 313.2057903519.

The spelling of 30724820 in words is "thirty million, seven hundred twenty-four thousand, eight hundred twenty".