28712025 has 18 divisors (see below), whose sum is σ = 51426830. Its totient is φ = 15312960.

The previous prime is 28712011. The next prime is 28712041. The reversal of 28712025 is 52021782.

It can be written as a sum of positive squares in 3 ways, for example, as 68121 + 28643904 = 261^2 + 5352^2 .

It is not a de Polignac number, because 28712025 - 2⁵ = 28711993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28712025.

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 17 ways as a sum of consecutive naturals, for example, 63580 + ... + 64029.

Almost surely, 2^28712025 is an apocalyptic number.

28712025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28712025 is a deficient number, since it is larger than the sum of its proper divisors (22714805).

28712025 is a wasteful number, since it uses less digits than its factorization.

28712025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127625 (or 127617 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 28712025 is about 5358.3602902381. The cubic root of 28712025 is about 306.2113431701.

The spelling of 28712025 in words is "twenty-eight million, seven hundred twelve thousand, twenty-five".