28561525 has 12 divisors (see below), whose sum is σ = 35917344. Its totient is φ = 22526000.

The previous prime is 28561501. The next prime is 28561531. The reversal of 28561525 is 52516582.

It is not a de Polignac number, because 28561525 - 2⁵ = 28561493 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 11 ways as a sum of consecutive naturals, for example, 6271 + ... + 9820.

It is an arithmetic number, because the mean of its divisors is an integer number (2993112).

Almost surely, 2^28561525 is an apocalyptic number.

28561525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28561525 is a deficient number, since it is larger than the sum of its proper divisors (7355819).

28561525 is a wasteful number, since it uses less digits than its factorization.

28561525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16172 (or 16167 counting only the distinct ones).

The product of its digits is 24000, while the sum is 34.

The square root of 28561525 is about 5344.2983636769. The cubic root of 28561525 is about 305.6753823261.

The spelling of 28561525 in words is "twenty-eight million, five hundred sixty-one thousand, five hundred twenty-five".