28501250 has 30 divisors (see below), whose sum is σ = 53778879. Its totient is φ = 11325000.

The previous prime is 28501241. The next prime is 28501327. The reversal of 28501250 is 5210582.

It can be written as a sum of positive squares in 3 ways, for example, as 6589489 + 21911761 = 2567^2 + 4681^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3775.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 188675 + ... + 188825.

Almost surely, 2^28501250 is an apocalyptic number.

28501250 is a deficient number, since it is larger than the sum of its proper divisors (25277629).

28501250 is an frugal number, since it uses more digits than its factorization.

28501250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 28501250 is about 5338.6561979584. The cubic root of 28501250 is about 305.4602028763.

Multiplying 28501250 by its product of nonzero digits (800), we get a square (22801000000 = 151000²).

The spelling of 28501250 in words is "twenty-eight million, five hundred one thousand, two hundred fifty".