30388628 has 6 divisors (see below), whose sum is σ = 53180106. Its totient is φ = 15194312.

The previous prime is 30388627. The next prime is 30388637. The reversal of 30388628 is 82688303.

It can be written as a sum of positive squares in only one way, i.e., 29463184 + 925444 = 5428^2 + 962^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30388591 and 30388600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30388627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3798575 + ... + 3798582.

It is an arithmetic number, because the mean of its divisors is an integer number (8863351).

Almost surely, 2^30388628 is an apocalyptic number.

It is an amenable number.

30388628 is a deficient number, since it is larger than the sum of its proper divisors (22791478).

30388628 is a wasteful number, since it uses less digits than its factorization.

30388628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7597161 (or 7597159 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 30388628 is about 5512.5881398849. The cubic root of 30388628 is about 312.0592288388.

The spelling of 30388628 in words is "thirty million, three hundred eighty-eight thousand, six hundred twenty-eight".