28172625 has 32 divisors (see below), whose sum is σ = 50494080. Its totient is φ = 13867200.

The previous prime is 28172609. The next prime is 28172633. The reversal of 28172625 is 52627182.

It is not a de Polignac number, because 28172625 - 2⁴ = 28172609 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 1986 + ... + 7764.

It is an arithmetic number, because the mean of its divisors is an integer number (1577940).

Almost surely, 2^28172625 is an apocalyptic number.

28172625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28172625 is a deficient number, since it is larger than the sum of its proper divisors (22321455).

28172625 is a wasteful number, since it uses less digits than its factorization.

28172625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5810 (or 5800 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 28172625 is about 5307.7890877464. The cubic root of 28172625 is about 304.2816562373.

The spelling of 28172625 in words is "twenty-eight million, one hundred seventy-two thousand, six hundred twenty-five".