28251685 has 36 divisors (see below), whose sum is σ = 43393644. Its totient is φ = 17592960.

The previous prime is 28251677. The next prime is 28251697. The reversal of 28251685 is 58615282.

It can be written as a sum of positive squares in 2 ways, for example, as 10962721 + 17288964 = 3311^2 + 4158^2 .

It is not a de Polignac number, because 28251685 - 2³ = 28251677 is a prime.

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 29169 + ... + 30121.

It is an arithmetic number, because the mean of its divisors is an integer number (1205379).

Almost surely, 2^28251685 is an apocalyptic number.

It is an amenable number.

28251685 is a deficient number, since it is larger than the sum of its proper divisors (15141959).

28251685 is a wasteful number, since it uses less digits than its factorization.

28251685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994 (or 976 counting only the distinct ones).

The product of its digits is 38400, while the sum is 37.

The square root of 28251685 is about 5315.2314154701. The cubic root of 28251685 is about 304.5660225887.

The spelling of 28251685 in words is "twenty-eight million, two hundred fifty-one thousand, six hundred eighty-five".