28287275 has 6 divisors (see below), whose sum is σ = 35076252. Its totient is φ = 22629800.

The previous prime is 28287241. The next prime is 28287289. The reversal of 28287275 is 57278282.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-28287275 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 565721 + ... + 565770.

It is an arithmetic number, because the mean of its divisors is an integer number (5846042).

Almost surely, 2^28287275 is an apocalyptic number.

28287275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28287275 is a deficient number, since it is larger than the sum of its proper divisors (6788977).

28287275 is a wasteful number, since it uses less digits than its factorization.

28287275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131501 (or 1131496 counting only the distinct ones).

The product of its digits is 125440, while the sum is 41.

The square root of 28287275 is about 5318.5782874750. The cubic root of 28287275 is about 304.6938610550.

The spelling of 28287275 in words is "twenty-eight million, two hundred eighty-seven thousand, two hundred seventy-five".