30028820 has 12 divisors (see below), whose sum is σ = 63060564. Its totient is φ = 12011520.

The previous prime is 30028813. The next prime is 30028837. The reversal of 30028820 is 2882003.

It can be written as a sum of positive squares in 2 ways, for example, as 7409284 + 22619536 = 2722^2 + 4756^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750701 + ... + 750740.

It is an arithmetic number, because the mean of its divisors is an integer number (5255047).

Almost surely, 2^30028820 is an apocalyptic number.

It is an amenable number.

30028820 is an abundant number, since it is smaller than the sum of its proper divisors (33031744).

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

30028820 is a wasteful number, since it uses less digits than its factorization.

30028820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501450 (or 1501448 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 30028820 is about 5479.8558375198. The cubic root of 30028820 is about 310.8227192399.

The spelling of 30028820 in words is "thirty million, twenty-eight thousand, eight hundred twenty".