28530090 has 32 divisors (see below), whose sum is σ = 76080960. Its totient is φ = 7607952.

The previous prime is 28530043. The next prime is 28530119. The reversal of 28530090 is 9003582.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52564 + ... + 53103.

It is an arithmetic number, because the mean of its divisors is an integer number (2377530).

Almost surely, 2^28530090 is an apocalyptic number.

28530090 is an abundant number, since it is smaller than the sum of its proper divisors (47550870).

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

28530090 is a wasteful number, since it uses less digits than its factorization.

28530090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105683 (or 105677 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 28530090 is about 5341.3565692622. The cubic root of 28530090 is about 305.5631983886.

It can be divided in two parts, 285300 and 90, that added together give a triangular number (285390 = T₇₅₅).

The spelling of 28530090 in words is "twenty-eight million, five hundred thirty thousand, ninety".