30728786 has 16 divisors (see below), whose sum is σ = 50368608. Its totient is φ = 13944000.

The previous prime is 30728771. The next prime is 30728821. The reversal of 30728786 is 68782703.

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, 24986 + ... + 26186.

It is an arithmetic number, because the mean of its divisors is an integer number (3148038).

Almost surely, 2^30728786 is an apocalyptic number.

30728786 is a deficient number, since it is larger than the sum of its proper divisors (19639822).

30728786 is a wasteful number, since it uses less digits than its factorization.

30728786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 30728786 is about 5543.3551212240. The cubic root of 30728786 is about 313.2192661099.

The spelling of 30728786 in words is "thirty million, seven hundred twenty-eight thousand, seven hundred eighty-six".