30813928 has 32 divisors (see below), whose sum is σ = 63840960. Its totient is φ = 13868800.

The previous prime is 30813901. The next prime is 30813941. The reversal of 30813928 is 82931803.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 30813893 and 30813902.

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, 1798 + ... + 8053.

It is an arithmetic number, because the mean of its divisors is an integer number (1995030).

Almost surely, 2^30813928 is an apocalyptic number.

It is an amenable number.

30813928 is an abundant number, since it is smaller than the sum of its proper divisors (33027032).

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

30813928 is a wasteful number, since it uses less digits than its factorization.

30813928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9897 (or 9893 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 30813928 is about 5551.0294540743. The cubic root of 30813928 is about 313.5082841695.

It can be divided in two parts, 308 and 13928, that multiplied together give a palindrome (4289824).

The spelling of 30813928 in words is "thirty million, eight hundred thirteen thousand, nine hundred twenty-eight".