28575252 has 18 divisors (see below), whose sum is σ = 72231978. Its totient is φ = 9525072.

The previous prime is 28575251. The next prime is 28575257. The reversal of 28575252 is 25257582.

It can be written as a sum of positive squares in only one way, i.e., 24265476 + 4309776 = 4926^2 + 2076^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 793757 = 28575252 / (2 + 8 + 5 + 7 + 5 + 2 + 5 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28575251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 396843 + ... + 396914.

Almost surely, 2^28575252 is an apocalyptic number.

It is an amenable number.

28575252 is an abundant number, since it is smaller than the sum of its proper divisors (43656726).

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

28575252 is a wasteful number, since it uses less digits than its factorization.

28575252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793767 (or 793762 counting only the distinct ones).

The product of its digits is 56000, while the sum is 36.

The square root of 28575252 is about 5345.5824752781. The cubic root of 28575252 is about 305.7243448603.

The spelling of 28575252 in words is "twenty-eight million, five hundred seventy-five thousand, two hundred fifty-two".