28004475 has 12 divisors (see below), whose sum is σ = 46300856. Its totient is φ = 14935680.

The previous prime is 28004447. The next prime is 28004477. The reversal of 28004475 is 57440082.

It is not a de Polignac number, because 28004475 - 2¹⁴ = 27988091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28004477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186622 + ... + 186771.

Almost surely, 2^28004475 is an apocalyptic number.

28004475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28004475 is a deficient number, since it is larger than the sum of its proper divisors (18296381).

28004475 is a wasteful number, since it uses less digits than its factorization.

28004475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373406 (or 373401 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 28004475 is about 5291.9254529897. The cubic root of 28004475 is about 303.6750733921.

The spelling of 28004475 in words is "twenty-eight million, four thousand, four hundred seventy-five".