28564975 has 6 divisors (see below), whose sum is σ = 35420600. Its totient is φ = 22851960.

The previous prime is 28564957. The next prime is 28564979. The reversal of 28564975 is 57946582.

It is not a de Polignac number, because 28564975 - 2²¹ = 26467823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28564979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 571275 + ... + 571324.

Almost surely, 2^28564975 is an apocalyptic number.

28564975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28564975 is a deficient number, since it is larger than the sum of its proper divisors (6855625).

28564975 is a wasteful number, since it uses less digits than its factorization.

28564975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142609 (or 1142604 counting only the distinct ones).

The product of its digits is 604800, while the sum is 46.

The square root of 28564975 is about 5344.6211278256. The cubic root of 28564975 is about 305.6876895309.

The spelling of 28564975 in words is "twenty-eight million, five hundred sixty-four thousand, nine hundred seventy-five".