28317275 has 24 divisors (see below), whose sum is σ = 40545024. Its totient is φ = 19216800.

The previous prime is 28317251. The next prime is 28317283. The reversal of 28317275 is 57271382.

It is not a de Polignac number, because 28317275 - 2¹² = 28313179 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17240 + ... + 18810.

It is an arithmetic number, because the mean of its divisors is an integer number (1689376).

Almost surely, 2^28317275 is an apocalyptic number.

28317275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28317275 is a deficient number, since it is larger than the sum of its proper divisors (12227749).

28317275 is a wasteful number, since it uses less digits than its factorization.

28317275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691 (or 1686 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 28317275 is about 5321.3978426725. The cubic root of 28317275 is about 304.8015371074.

The spelling of 28317275 in words is "twenty-eight million, three hundred seventeen thousand, two hundred seventy-five".