28227172 has 6 divisors (see below), whose sum is σ = 49397558. Its totient is φ = 14113584.

The previous prime is 28227169. The next prime is 28227181. The reversal of 28227172 is 27172282.

It can be written as a sum of positive squares in only one way, i.e., 19501056 + 8726116 = 4416^2 + 2954^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3528393 + ... + 3528400.

Almost surely, 2^28227172 is an apocalyptic number.

It is an amenable number.

28227172 is a deficient number, since it is larger than the sum of its proper divisors (21170386).

28227172 is a wasteful number, since it uses less digits than its factorization.

28227172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7056797 (or 7056795 counting only the distinct ones).

The product of its digits is 6272, while the sum is 31.

The square root of 28227172 is about 5312.9249947651. The cubic root of 28227172 is about 304.4779100008.

The spelling of 28227172 in words is "twenty-eight million, two hundred twenty-seven thousand, one hundred seventy-two".