30457028 has 48 divisors (see below), whose sum is σ = 63168000. Its totient is φ = 12841920.

The previous prime is 30457027. The next prime is 30457067. The reversal of 30457028 is 82075403.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (30457027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108248 + ... + 108528.

It is an arithmetic number, because the mean of its divisors is an integer number (1316000).

Almost surely, 2^30457028 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 30457028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31584000).

30457028 is an abundant number, since it is smaller than the sum of its proper divisors (32710972).

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

30457028 is a wasteful number, since it uses less digits than its factorization.

30457028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385 (or 369 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 30457028 is about 5518.7886351989. The cubic root of 30457028 is about 312.2931853989.

The spelling of 30457028 in words is "thirty million, four hundred fifty-seven thousand, twenty-eight".