28660525 has 6 divisors (see below), whose sum is σ = 35539082. Its totient is φ = 22928400.

The previous prime is 28660519. The next prime is 28660543. The reversal of 28660525 is 52506682.

It can be written as a sum of positive squares in 3 ways, for example, as 9326916 + 19333609 = 3054^2 + 4397^2 .

It is not a de Polignac number, because 28660525 - 2⁷ = 28660397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 573186 + ... + 573235.

Almost surely, 2^28660525 is an apocalyptic number.

28660525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28660525 is a deficient number, since it is larger than the sum of its proper divisors (6878557).

28660525 is a wasteful number, since it uses less digits than its factorization.

28660525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146431 (or 1146426 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 28660525 is about 5353.5525588155. The cubic root of 28660525 is about 306.0281525354.

The spelling of 28660525 in words is "twenty-eight million, six hundred sixty thousand, five hundred twenty-five".