30812928 has 72 divisors (see below), whose sum is σ = 83665008. Its totient is φ = 10063872.

The previous prime is 30812917. The next prime is 30812933. The reversal of 30812928 is 82921803.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40326 + ... + 41082.

It is an arithmetic number, because the mean of its divisors is an integer number (1162014).

Almost surely, 2^30812928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30812928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41832504).

30812928 is an abundant number, since it is smaller than the sum of its proper divisors (52852080).

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

30812928 is an equidigital number, since it uses as much as digits as its factorization.

30812928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829 (or 815 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 30812928 is about 5550.9393799608. The cubic root of 30812928 is about 313.5048927196.

The spelling of 30812928 in words is "thirty million, eight hundred twelve thousand, nine hundred twenty-eight".