30788428 has 24 divisors (see below), whose sum is σ = 62236944. Its totient is φ = 13171200.

The previous prime is 30788423. The next prime is 30788437. The reversal of 30788428 is 82488703.

It is a super-2 number, since 2×30788428² = 1895854597422368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30788423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19833 + ... + 21328.

It is an arithmetic number, because the mean of its divisors is an integer number (2593206).

Almost surely, 2^30788428 is an apocalyptic number.

It is an amenable number.

30788428 is an abundant number, since it is smaller than the sum of its proper divisors (31448516).

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

30788428 is a wasteful number, since it uses less digits than its factorization.

30788428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41193 (or 41191 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 30788428 is about 5548.7321074278. The cubic root of 30788428 is about 313.4217792668.

It can be divided in two parts, 307 and 88428, that multiplied together give a triangular number (27147396 = T₇₃₆₈).

The spelling of 30788428 in words is "thirty million, seven hundred eighty-eight thousand, four hundred twenty-eight".