28251172 has 12 divisors (see below), whose sum is σ = 50589616. Its totient is φ = 13797000.

The previous prime is 28251151. The next prime is 28251193. The reversal of 28251172 is 27115282.

It is an interprime number because it is at equal distance from previous prime (28251151) and next prime (28251193).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28251172.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81954 + ... + 82297.

Almost surely, 2^28251172 is an apocalyptic number.

It is an amenable number.

28251172 is a deficient number, since it is larger than the sum of its proper divisors (22338444).

28251172 is a wasteful number, since it uses less digits than its factorization.

28251172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164298 (or 164296 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 28251172 is about 5315.1831577096. The cubic root of 28251172 is about 304.5641791197.

The spelling of 28251172 in words is "twenty-eight million, two hundred fifty-one thousand, one hundred seventy-two".