28277525 has 24 divisors (see below), whose sum is σ = 36158400. Its totient is φ = 21929600.

The previous prime is 28277521. The next prime is 28277527. The reversal of 28277525 is 52577282.

It is not a de Polignac number, because 28277525 - 2² = 28277521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28277521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157886 + ... + 158064.

It is an arithmetic number, because the mean of its divisors is an integer number (1506600).

Almost surely, 2^28277525 is an apocalyptic number.

28277525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28277525 is a deficient number, since it is larger than the sum of its proper divisors (7880875).

28277525 is a wasteful number, since it uses less digits than its factorization.

28277525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 344 counting only the distinct ones).

The product of its digits is 78400, while the sum is 38.

The square root of 28277525 is about 5317.6616101441. The cubic root of 28277525 is about 304.6588499469.

The spelling of 28277525 in words is "twenty-eight million, two hundred seventy-seven thousand, five hundred twenty-five".