28008525 has 12 divisors (see below), whose sum is σ = 46307552. Its totient is φ = 14937840.

The previous prime is 28008517. The next prime is 28008551. The reversal of 28008525 is 52580082.

It is not a de Polignac number, because 28008525 - 2³ = 28008517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28008492 and 28008501.

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, 186649 + ... + 186798.

Almost surely, 2^28008525 is an apocalyptic number.

28008525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28008525 is a deficient number, since it is larger than the sum of its proper divisors (18299027).

28008525 is a wasteful number, since it uses less digits than its factorization.

28008525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373460 (or 373455 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 28008525 is about 5292.3080976073. The cubic root of 28008525 is about 303.6897118235.

It can be divided in two parts, 2800 and 8525, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 28008525 in words is "twenty-eight million, eight thousand, five hundred twenty-five".