28251171 has 12 divisors (see below), whose sum is σ = 43946448. Its totient is φ = 17385264.

The previous prime is 28251151. The next prime is 28251193. The reversal of 28251171 is 17115282.

28251171 is a `hidden beast` number, since 2 + 82 + 511 + 71 = 666.

It is not a de Polignac number, because 28251171 - 2⁹ = 28250659 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28251101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120615 + ... + 120848.

It is an arithmetic number, because the mean of its divisors is an integer number (3662204).

Almost surely, 2^28251171 is an apocalyptic number.

28251171 is a deficient number, since it is larger than the sum of its proper divisors (15695277).

28251171 is a wasteful number, since it uses less digits than its factorization.

28251171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241482 (or 241479 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 28251171 is about 5315.1830636395. The cubic root of 28251171 is about 304.5641755262.

The spelling of 28251171 in words is "twenty-eight million, two hundred fifty-one thousand, one hundred seventy-one".