28564375 has 20 divisors (see below), whose sum is σ = 40799440. Its totient is φ = 19584000.

The previous prime is 28564373. The next prime is 28564379. The reversal of 28564375 is 57346582.

It is not a de Polignac number, because 28564375 - 2¹ = 28564373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28564373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1111 + ... + 7639.

It is an arithmetic number, because the mean of its divisors is an integer number (2039972).

Almost surely, 2^28564375 is an apocalyptic number.

28564375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28564375 is a deficient number, since it is larger than the sum of its proper divisors (12235065).

28564375 is an frugal number, since it uses more digits than its factorization.

28564375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6556 (or 6541 counting only the distinct ones).

The product of its digits is 201600, while the sum is 40.

The square root of 28564375 is about 5344.5649963304. The cubic root of 28564375 is about 305.6855492186.

The spelling of 28564375 in words is "twenty-eight million, five hundred sixty-four thousand, three hundred seventy-five".