30912028 has 24 divisors (see below), whose sum is σ = 63957600. Its totient is φ = 12790848.

The previous prime is 30912019. The next prime is 30912029. The reversal of 30912028 is 82021903.

It is a junction number, because it is equal to n+sod(n) for n = 30911993 and 30912011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30912029) 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, 18223 + ... + 19846.

It is an arithmetic number, because the mean of its divisors is an integer number (2664900).

Almost surely, 2^30912028 is an apocalyptic number.

It is an amenable number.

30912028 is an abundant number, since it is smaller than the sum of its proper divisors (33045572).

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

30912028 is a wasteful number, since it uses less digits than its factorization.

30912028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38109 (or 38107 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 30912028 is about 5559.8586312963. The cubic root of 30912028 is about 313.8406293636.

The spelling of 30912028 in words is "thirty million, nine hundred twelve thousand, twenty-eight".