30028428 has 24 divisors (see below), whose sum is σ = 77851760. Its totient is φ = 10009440.

The previous prime is 30028403. The next prime is 30028433. The reversal of 30028428 is 82482003.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138913 + ... + 139128.

Almost surely, 2^30028428 is an apocalyptic number.

It is an amenable number.

30028428 is an abundant number, since it is smaller than the sum of its proper divisors (47823332).

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

30028428 is a wasteful number, since it uses less digits than its factorization.

30028428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278054 (or 278046 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 30028428 is about 5479.8200700388. The cubic root of 30028428 is about 310.8213667277.

The spelling of 30028428 in words is "thirty million, twenty-eight thousand, four hundred twenty-eight".