28004275 has 24 divisors (see below), whose sum is σ = 37671200. Its totient is φ = 20528640.

The previous prime is 28004269. The next prime is 28004279. The reversal of 28004275 is 57240082.

It is not a de Polignac number, because 28004275 - 2³ = 28004267 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28004279) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64459 + ... + 64891.

Almost surely, 2^28004275 is an apocalyptic number.

28004275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28004275 is a deficient number, since it is larger than the sum of its proper divisors (9666925).

28004275 is a wasteful number, since it uses less digits than its factorization.

28004275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 28004275 is about 5291.9065562423. The cubic root of 28004275 is about 303.6743504700.

The spelling of 28004275 in words is "twenty-eight million, four thousand, two hundred seventy-five".