28135275 has 24 divisors (see below), whose sum is σ = 53163264. Its totient is φ = 12861600.

The previous prime is 28135231. The next prime is 28135277. The reversal of 28135275 is 57253182.

It is not a de Polignac number, because 28135275 - 2⁷ = 28135147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28135277) 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, 26271 + ... + 27320.

It is an arithmetic number, because the mean of its divisors is an integer number (2215136).

Almost surely, 2^28135275 is an apocalyptic number.

28135275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28135275 is a deficient number, since it is larger than the sum of its proper divisors (25027989).

28135275 is a wasteful number, since it uses less digits than its factorization.

28135275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53611 (or 53606 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 28135275 is about 5304.2695067276. The cubic root of 28135275 is about 304.1471291218.

The spelling of 28135275 in words is "twenty-eight million, one hundred thirty-five thousand, two hundred seventy-five".