28255525 has 12 divisors (see below), whose sum is σ = 35361700. Its totient is φ = 22394880.

The previous prime is 28255517. The next prime is 28255529. The reversal of 28255525 is 52555282.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2712609 + 25542916 = 1647^2 + 5054^2 .

It is not a de Polignac number, because 28255525 - 2³ = 28255517 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28255529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2460 + ... + 7909.

Almost surely, 2^28255525 is an apocalyptic number.

28255525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28255525 is a deficient number, since it is larger than the sum of its proper divisors (7106175).

28255525 is a wasteful number, since it uses less digits than its factorization.

28255525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10488 (or 10483 counting only the distinct ones).

The product of its digits is 40000, while the sum is 34.

The square root of 28255525 is about 5315.5926292371. The cubic root of 28255525 is about 304.5798209461.

The spelling of 28255525 in words is "twenty-eight million, two hundred fifty-five thousand, five hundred twenty-five".