28113172 has 12 divisors (see below), whose sum is σ = 52092180. Its totient is φ = 13229696.

The previous prime is 28113149. The next prime is 28113181. The reversal of 28113172 is 27131182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10523536 + 17589636 = 3244^2 + 4194^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 206647 + ... + 206782.

It is an arithmetic number, because the mean of its divisors is an integer number (4341015).

Almost surely, 2^28113172 is an apocalyptic number.

It is an amenable number.

28113172 is a deficient number, since it is larger than the sum of its proper divisors (23979008).

28113172 is a wasteful number, since it uses less digits than its factorization.

28113172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413450 (or 413448 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 28113172 is about 5302.1855870952. The cubic root of 28113172 is about 304.0674625209.

The spelling of 28113172 in words is "twenty-eight million, one hundred thirteen thousand, one hundred seventy-two".