28775625 has 40 divisors (see below), whose sum is σ = 48734400. Its totient is φ = 15096000.

The previous prime is 28775597. The next prime is 28775653. The reversal of 28775625 is 52657782.

It is an interprime number because it is at equal distance from previous prime (28775597) and next prime (28775653).

It is not a de Polignac number, because 28775625 - 2⁹ = 28775113 is a prime.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 193051 + ... + 193199.

It is an arithmetic number, because the mean of its divisors is an integer number (1218360).

Almost surely, 2^28775625 is an apocalyptic number.

28775625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28775625 is a deficient number, since it is larger than the sum of its proper divisors (19958775).

28775625 is a wasteful number, since it uses less digits than its factorization.

28775625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 260 counting only the distinct ones).

The product of its digits is 235200, while the sum is 42.

The square root of 28775625 is about 5364.2916587374. The cubic root of 28775625 is about 306.4372726587.

The spelling of 28775625 in words is "twenty-eight million, seven hundred seventy-five thousand, six hundred twenty-five".