28521252 has 18 divisors (see below), whose sum is σ = 72095478. Its totient is φ = 9507072.

The previous prime is 28521247. The next prime is 28521253. The reversal of 28521252 is 25212582.

It can be written as a sum of positive squares in only one way, i.e., 28451556 + 69696 = 5334^2 + 264^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28521253) 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, 396093 + ... + 396164.

Almost surely, 2^28521252 is an apocalyptic number.

It is an amenable number.

28521252 is an abundant number, since it is smaller than the sum of its proper divisors (43574226).

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

28521252 is a wasteful number, since it uses less digits than its factorization.

28521252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792267 (or 792262 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 28521252 is about 5340.5291872623. The cubic root of 28521252 is about 305.5316428571.

The spelling of 28521252 in words is "twenty-eight million, five hundred twenty-one thousand, two hundred fifty-two".