28077525 has 36 divisors (see below), whose sum is σ = 57477472. Its totient is φ = 12834720.

The previous prime is 28077521. The next prime is 28077529. The reversal of 28077525 is 52577082.

It is an interprime number because it is at equal distance from previous prime (28077521) and next prime (28077529).

It is not a de Polignac number, because 28077525 - 2² = 28077521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28077525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28077521) 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, 7339 + ... + 10488.

Almost surely, 2^28077525 is an apocalyptic number.

28077525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28077525 is an abundant number, since it is smaller than the sum of its proper divisors (29399947).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28077525 is a wasteful number, since it uses less digits than its factorization.

28077525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17850 (or 17842 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 28077525 is about 5298.8229825122. The cubic root of 28077525 is about 303.9388907928.

The spelling of 28077525 in words is "twenty-eight million, seventy-seven thousand, five hundred twenty-five".