28656425 has 36 divisors (see below), whose sum is σ = 41877900. Its totient is φ = 19393920.

The previous prime is 28656409. The next prime is 28656451. The reversal of 28656425 is 52465682.

It can be written as a sum of positive squares in 6 ways, for example, as 5798464 + 22857961 = 2408^2 + 4781^2 .

It is not a de Polignac number, because 28656425 - 2⁴ = 28656409 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 182447 + ... + 182603.

It is an arithmetic number, because the mean of its divisors is an integer number (1163275).

Almost surely, 2^28656425 is an apocalyptic number.

28656425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28656425 is a deficient number, since it is larger than the sum of its proper divisors (13221475).

28656425 is a wasteful number, since it uses less digits than its factorization.

28656425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 318 counting only the distinct ones).

The product of its digits is 115200, while the sum is 38.

The square root of 28656425 is about 5353.1696218222. The cubic root of 28656425 is about 306.0135589988.

The spelling of 28656425 in words is "twenty-eight million, six hundred fifty-six thousand, four hundred twenty-five".