28783275 has 12 divisors (see below), whose sum is σ = 47588472. Its totient is φ = 15351040.

The previous prime is 28783219. The next prime is 28783301. The reversal of 28783275 is 57238782.

It is not a de Polignac number, because 28783275 - 2⁸ = 28783019 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 191814 + ... + 191963.

It is an arithmetic number, because the mean of its divisors is an integer number (3965706).

Almost surely, 2^28783275 is an apocalyptic number.

28783275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28783275 is a deficient number, since it is larger than the sum of its proper divisors (18805197).

28783275 is a wasteful number, since it uses less digits than its factorization.

28783275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383790 (or 383785 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The square root of 28783275 is about 5365.0046598302. The cubic root of 28783275 is about 306.4644257026.

The spelling of 28783275 in words is "twenty-eight million, seven hundred eighty-three thousand, two hundred seventy-five".