28530990 has 24 divisors (see below), whose sum is σ = 74180808. Its totient is φ = 7608240.

The previous prime is 28530979. The next prime is 28531051. The reversal of 28530990 is 9903582.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158416 + ... + 158595.

It is an arithmetic number, because the mean of its divisors is an integer number (3090867).

Almost surely, 2^28530990 is an apocalyptic number.

28530990 is an abundant number, since it is smaller than the sum of its proper divisors (45649818).

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

28530990 is a wasteful number, since it uses less digits than its factorization.

28530990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317024 (or 317021 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 28530990 is about 5341.4408168583. The cubic root of 28530990 is about 305.5664114172.

The spelling of 28530990 in words is "twenty-eight million, five hundred thirty thousand, nine hundred ninety".