28785250 has 64 divisors (see below), whose sum is σ = 61562592. Its totient is φ = 9984000.

The previous prime is 28785221. The next prime is 28785257. The reversal of 28785250 is 5258782.

It can be written as a sum of positive squares in 16 ways, for example, as 3775249 + 25010001 = 1943^2 + 5001^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28785257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54990 + ... + 55510.

Almost surely, 2^28785250 is an apocalyptic number.

28785250 is an abundant number, since it is smaller than the sum of its proper divisors (32777342).

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

28785250 is a wasteful number, since it uses less digits than its factorization.

28785250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 28785250 is about 5365.1887198867. The cubic root of 28785250 is about 306.4714350208.

It can be divided in two parts, 2878 and 5250, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 28785250 in words is "twenty-eight million, seven hundred eighty-five thousand, two hundred fifty".