30856928 has 48 divisors (see below), whose sum is σ = 64456560. Its totient is φ = 14515200.

The previous prime is 30856909. The next prime is 30856939. The reversal of 30856928 is 82965803.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

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, 37643 + ... + 38453.

It is an arithmetic number, because the mean of its divisors is an integer number (1342845).

Almost surely, 2^30856928 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 30856928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32228280).

30856928 is an abundant number, since it is smaller than the sum of its proper divisors (33599632).

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

30856928 is a wasteful number, since it uses less digits than its factorization.

30856928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891 (or 883 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 30856928 is about 5554.9012592484. The cubic root of 30856928 is about 313.6540471543.

The spelling of 30856928 in words is "thirty million, eight hundred fifty-six thousand, nine hundred twenty-eight".