28081275 has 48 divisors (see below), whose sum is σ = 49330176. Its totient is φ = 14065920.

The previous prime is 28081253. The next prime is 28081337. The reversal of 28081275 is 57218082.

It is not a de Polignac number, because 28081275 - 2⁵ = 28081243 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 125814 + ... + 126036.

It is an arithmetic number, because the mean of its divisors is an integer number (1027712).

Almost surely, 2^28081275 is an apocalyptic number.

28081275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28081275 is a deficient number, since it is larger than the sum of its proper divisors (21248901).

28081275 is a wasteful number, since it uses less digits than its factorization.

28081275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 28081275 is about 5299.1768228660. The cubic root of 28081275 is about 303.9524214263.

The spelling of 28081275 in words is "twenty-eight million, eighty-one thousand, two hundred seventy-five".