30028257 has 12 divisors (see below), whose sum is σ = 49570560. Its totient is φ = 17158968.

The previous prime is 30028249. The next prime is 30028259. The reversal of 30028257 is 75282003.

It is not a de Polignac number, because 30028257 - 2³ = 30028249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30028257.

It is not an unprimeable number, because it can be changed into a prime (30028259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238257 + ... + 238382.

It is an arithmetic number, because the mean of its divisors is an integer number (4130880).

Almost surely, 2^30028257 is an apocalyptic number.

It is an amenable number.

30028257 is a deficient number, since it is larger than the sum of its proper divisors (19542303).

30028257 is a wasteful number, since it uses less digits than its factorization.

30028257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476652 (or 476649 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 30028257 is about 5479.8044673145. The cubic root of 30028257 is about 310.8207767251.

The spelling of 30028257 in words is "thirty million, twenty-eight thousand, two hundred fifty-seven".