28565725 has 36 divisors (see below), whose sum is σ = 38786580. Its totient is φ = 20832000.

The previous prime is 28565723. The next prime is 28565731. The reversal of 28565725 is 52756582.

It can be written as a sum of positive squares in 6 ways, for example, as 4575321 + 23990404 = 2139^2 + 4898^2 .

It is not a de Polignac number, because 28565725 - 2¹ = 28565723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28565723) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 696705 + ... + 696745.

It is an arithmetic number, because the mean of its divisors is an integer number (1077405).

Almost surely, 2^28565725 is an apocalyptic number.

28565725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28565725 is a deficient number, since it is larger than the sum of its proper divisors (10220855).

28565725 is a wasteful number, since it uses less digits than its factorization.

28565725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 106 counting only the distinct ones).

The product of its digits is 168000, while the sum is 40.

The square root of 28565725 is about 5344.6912913657. The cubic root of 28565725 is about 305.6903648790.

The spelling of 28565725 in words is "twenty-eight million, five hundred sixty-five thousand, seven hundred twenty-five".