28356525 has 36 divisors (see below), whose sum is σ = 51131028. Its totient is φ = 15022080.

The previous prime is 28356511. The next prime is 28356529. The reversal of 28356525 is 52565382.

It is a happy number.

28356525 is a `hidden beast` number, since 2 + 83 + 56 + 525 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 4678569 + 23677956 = 2163^2 + 4866^2 .

It is not a de Polignac number, because 28356525 - 2⁸ = 28356269 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28356525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28356529) 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, 43099 + ... + 43751.

Almost surely, 2^28356525 is an apocalyptic number.

28356525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28356525 is a deficient number, since it is larger than the sum of its proper divisors (22774503).

28356525 is a wasteful number, since it uses less digits than its factorization.

28356525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 854 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 28356525 is about 5325.0845063717. The cubic root of 28356525 is about 304.9422984994.

The spelling of 28356525 in words is "twenty-eight million, three hundred fifty-six thousand, five hundred twenty-five".