28557275 has 12 divisors (see below), whose sum is σ = 35612304. Its totient is φ = 22716000.

The previous prime is 28557241. The next prime is 28557299. The reversal of 28557275 is 57275582.

It is not a de Polignac number, because 28557275 - 2¹⁰ = 28556251 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1370 + ... + 7680.

It is an arithmetic number, because the mean of its divisors is an integer number (2967692).

Almost surely, 2^28557275 is an apocalyptic number.

28557275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28557275 is a deficient number, since it is larger than the sum of its proper divisors (7055029).

28557275 is a wasteful number, since it uses less digits than its factorization.

28557275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6502 (or 6497 counting only the distinct ones).

The product of its digits is 196000, while the sum is 41.

The square root of 28557275 is about 5343.9007288684. The cubic root of 28557275 is about 305.6602199142.

The spelling of 28557275 in words is "twenty-eight million, five hundred fifty-seven thousand, two hundred seventy-five".