28775271 has 16 divisors (see below), whose sum is σ = 46427904. Its totient is φ = 15475584.

The previous prime is 28775261. The next prime is 28775273. The reversal of 28775271 is 17257782.

28775271 = 414² + 415² + ... + 539².

It is not a de Polignac number, because 28775271 - 2⁵ = 28775239 is a prime.

It is a super-2 number, since 2×28775271² = 1656032442246882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28775273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39945 + ... + 40658.

It is an arithmetic number, because the mean of its divisors is an integer number (2901744).

Almost surely, 2^28775271 is an apocalyptic number.

28775271 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28775271 is a deficient number, since it is larger than the sum of its proper divisors (17652633).

28775271 is a wasteful number, since it uses less digits than its factorization.

28775271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80630.

The product of its digits is 54880, while the sum is 39.

The square root of 28775271 is about 5364.2586626672. The cubic root of 28775271 is about 306.4360160484.

The spelling of 28775271 in words is "twenty-eight million, seven hundred seventy-five thousand, two hundred seventy-one".