28090525 has 6 divisors (see below), whose sum is σ = 34832282. Its totient is φ = 22472400.

The previous prime is 28090507. The next prime is 28090541. The reversal of 28090525 is 52509082.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 5184729 + 22905796 = 2277^2 + 4786^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28090525 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 561786 + ... + 561835.

Almost surely, 2^28090525 is an apocalyptic number.

28090525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28090525 is a deficient number, since it is larger than the sum of its proper divisors (6741757).

28090525 is a wasteful number, since it uses less digits than its factorization.

28090525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123631 (or 1123626 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 28090525 is about 5300.0495280705. The cubic root of 28090525 is about 303.9857918394.

The spelling of 28090525 in words is "twenty-eight million, ninety thousand, five hundred twenty-five".