28784275 has 24 divisors (see below), whose sum is σ = 39691904. Its totient is φ = 20563200.

The previous prime is 28784263. The next prime is 28784279. The reversal of 28784275 is 57248782.

It is not a de Polignac number, because 28784275 - 2¹¹ = 28782227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28784279) 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, 8647 + ... + 11503.

Almost surely, 2^28784275 is an apocalyptic number.

28784275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28784275 is a deficient number, since it is larger than the sum of its proper divisors (10907629).

28784275 is a wasteful number, since it uses less digits than its factorization.

28784275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911 (or 2906 counting only the distinct ones).

The product of its digits is 250880, while the sum is 43.

The square root of 28784275 is about 5365.0978555847. The cubic root of 28784275 is about 306.4679747646.

The spelling of 28784275 in words is "twenty-eight million, seven hundred eighty-four thousand, two hundred seventy-five".