28081252 has 12 divisors (see below), whose sum is σ = 51278976. Its totient is φ = 13430120.

The previous prime is 28081243. The next prime is 28081253. The reversal of 28081252 is 25218082.

It is a self number, because there is not a number n which added to its sum of digits gives 28081252.

It is not an unprimeable number, because it can be changed into a prime (28081253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152524 + ... + 152707.

It is an arithmetic number, because the mean of its divisors is an integer number (4273248).

Almost surely, 2^28081252 is an apocalyptic number.

It is an amenable number.

28081252 is a deficient number, since it is larger than the sum of its proper divisors (23197724).

28081252 is a wasteful number, since it uses less digits than its factorization.

28081252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305258 (or 305256 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 28081252 is about 5299.1746527172. The cubic root of 28081252 is about 303.9523384421.

The spelling of 28081252 in words is "twenty-eight million, eighty-one thousand, two hundred fifty-two".