28704275 has 6 divisors (see below), whose sum is σ = 35593332. Its totient is φ = 22963400.

The previous prime is 28704271. The next prime is 28704281. The reversal of 28704275 is 57240782.

It is not a de Polignac number, because 28704275 - 2² = 28704271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28704271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 574061 + ... + 574110.

It is an arithmetic number, because the mean of its divisors is an integer number (5932222).

Almost surely, 2^28704275 is an apocalyptic number.

28704275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28704275 is a deficient number, since it is larger than the sum of its proper divisors (6889057).

28704275 is a wasteful number, since it uses less digits than its factorization.

28704275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148181 (or 1148176 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 28704275 is about 5357.6370724415. The cubic root of 28704275 is about 306.1837896571.

The spelling of 28704275 in words is "twenty-eight million, seven hundred four thousand, two hundred seventy-five".