28775269 has 4 divisors (see below), whose sum is σ = 28947744. Its totient is φ = 28602796.

The previous prime is 28775261. The next prime is 28775273. The reversal of 28775269 is 96257782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96257782 = 2 ⋅48128891.

It is a cyclic number.

It is not a de Polignac number, because 28775269 - 2³ = 28775261 is a prime.

It is a super-2 number, since 2×28775269² = 1656032212044722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28775261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85987 + ... + 86320.

It is an arithmetic number, because the mean of its divisors is an integer number (7236936).

Almost surely, 2^28775269 is an apocalyptic number.

It is an amenable number.

28775269 is a deficient number, since it is larger than the sum of its proper divisors (172475).

28775269 is a wasteful number, since it uses less digits than its factorization.

28775269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172474.

The product of its digits is 423360, while the sum is 46.

The square root of 28775269 is about 5364.2584762481. The cubic root of 28775269 is about 306.4360089489.

The spelling of 28775269 in words is "twenty-eight million, seven hundred seventy-five thousand, two hundred sixty-nine".