28172252 has 6 divisors (see below), whose sum is σ = 49301448. Its totient is φ = 14086124.

The previous prime is 28172201. The next prime is 28172299. The reversal of 28172252 is 25227182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3521528 + ... + 3521535.

It is an arithmetic number, because the mean of its divisors is an integer number (8216908).

Almost surely, 2^28172252 is an apocalyptic number.

It is an amenable number.

28172252 is a deficient number, since it is larger than the sum of its proper divisors (21129196).

28172252 is a wasteful number, since it uses less digits than its factorization.

28172252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043067 (or 7043065 counting only the distinct ones).

The product of its digits is 4480, while the sum is 29.

The square root of 28172252 is about 5307.7539505896. The cubic root of 28172252 is about 304.2803133550.

The spelling of 28172252 in words is "twenty-eight million, one hundred seventy-two thousand, two hundred fifty-two".