28863172 has 18 divisors (see below), whose sum is σ = 54696138. Its totient is φ = 13321152.

The previous prime is 28863169. The next prime is 28863173. The reversal of 28863172 is 27136882.

It can be written as a sum of positive squares in 3 ways, for example, as 1153476 + 27709696 = 1074^2 + 5264^2 .

It is not an unprimeable number, because it can be changed into a prime (28863173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20673 + ... + 22024.

Almost surely, 2^28863172 is an apocalyptic number.

It is an amenable number.

28863172 is a deficient number, since it is larger than the sum of its proper divisors (25832966).

28863172 is a wasteful number, since it uses less digits than its factorization.

28863172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42727 (or 42712 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 28863172 is about 5372.4456255973. The cubic root of 28863172 is about 306.7477264191.

The spelling of 28863172 in words is "twenty-eight million, eight hundred sixty-three thousand, one hundred seventy-two".