28569375 has 40 divisors (see below), whose sum is σ = 52920560. Its totient is φ = 15228000.

The previous prime is 28569371. The next prime is 28569377. The reversal of 28569375 is 57396582.

It is a happy number.

It is not a de Polignac number, because 28569375 - 2² = 28569371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28569375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28569371) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16029 + ... + 17721.

It is an arithmetic number, because the mean of its divisors is an integer number (1323014).

Almost surely, 2^28569375 is an apocalyptic number.

28569375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28569375 is a deficient number, since it is larger than the sum of its proper divisors (24351185).

28569375 is an equidigital number, since it uses as much as digits as its factorization.

28569375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722 (or 1701 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 28569375 is about 5345.0327407790. The cubic root of 28569375 is about 305.7033842383.

The spelling of 28569375 in words is "twenty-eight million, five hundred sixty-nine thousand, three hundred seventy-five".