30728538 has 16 divisors (see below), whose sum is σ = 68285760. Its totient is φ = 10242828.

The previous prime is 30728527. The next prime is 30728549. The reversal of 30728538 is 83582703.

It is an interprime number because it is at equal distance from previous prime (30728527) and next prime (30728549).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 7 ways as a sum of consecutive naturals, for example, 284470 + ... + 284577.

It is an arithmetic number, because the mean of its divisors is an integer number (4267860).

Almost surely, 2^30728538 is an apocalyptic number.

30728538 is an abundant number, since it is smaller than the sum of its proper divisors (37557222).

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

30728538 is a wasteful number, since it uses less digits than its factorization.

30728538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569058 (or 569052 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 30728538 is about 5543.3327520545. The cubic root of 30728538 is about 313.2184234843.

The spelling of 30728538 in words is "thirty million, seven hundred twenty-eight thousand, five hundred thirty-eight".