28087925 has 6 divisors (see below), whose sum is σ = 34829058. Its totient is φ = 22470320.

The previous prime is 28087919. The next prime is 28087931. The reversal of 28087925 is 52978082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28087919) and next prime (28087931).

It can be written as a sum of positive squares in 3 ways, for example, as 1965604 + 26122321 = 1402^2 + 5111^2 .

It is not a de Polignac number, because 28087925 - 2⁶ = 28087861 is a prime.

It is a Duffinian number.

It is a Curzon 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, 561734 + ... + 561783.

It is an arithmetic number, because the mean of its divisors is an integer number (5804843).

Almost surely, 2^28087925 is an apocalyptic number.

28087925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28087925 is a deficient number, since it is larger than the sum of its proper divisors (6741133).

28087925 is a wasteful number, since it uses less digits than its factorization.

28087925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123527 (or 1123522 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 28087925 is about 5299.8042416678. The cubic root of 28087925 is about 303.9764127879.

The spelling of 28087925 in words is "twenty-eight million, eighty-seven thousand, nine hundred twenty-five".