30816728 has 32 divisors (see below), whose sum is σ = 59986560. Its totient is φ = 14826240.

The previous prime is 30816701. The next prime is 30816739. The reversal of 30816728 is 82761803.

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, 77426 + ... + 77822.

It is an arithmetic number, because the mean of its divisors is an integer number (1874580).

Almost surely, 2^30816728 is an apocalyptic number.

It is an amenable number.

30816728 is a deficient number, since it is larger than the sum of its proper divisors (29169832).

30816728 is a wasteful number, since it uses less digits than its factorization.

30816728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747 (or 743 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 30816728 is about 5551.2816538165. The cubic root of 30816728 is about 313.5177798388.

The spelling of 30816728 in words is "thirty million, eight hundred sixteen thousand, seven hundred twenty-eight".