28211252 has 6 divisors (see below), whose sum is σ = 49369698. Its totient is φ = 14105624.

The previous prime is 28211237. The next prime is 28211291. The reversal of 28211252 is 25211282.

It can be written as a sum of positive squares in only one way, i.e., 15792676 + 12418576 = 3974^2 + 3524^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3526403 + ... + 3526410.

It is an arithmetic number, because the mean of its divisors is an integer number (8228283).

Almost surely, 2^28211252 is an apocalyptic number.

It is an amenable number.

28211252 is a deficient number, since it is larger than the sum of its proper divisors (21158446).

28211252 is a wasteful number, since it uses less digits than its factorization.

28211252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7052817 (or 7052815 counting only the distinct ones).

The product of its digits is 640, while the sum is 23.

The square root of 28211252 is about 5311.4265503723. The cubic root of 28211252 is about 304.4206578385.

The spelling of 28211252 in words is "twenty-eight million, two hundred eleven thousand, two hundred fifty-two".