28227969 has 81 divisors (see below), whose sum is σ = 54499809. Its totient is φ = 14026320.

The previous prime is 28227961. The next prime is 28227989. The reversal of 28227969 is 96972282.

The square root of 28227969 is 5313.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 28227969 - 2³ = 28227961 is a prime.

It is a super-2 number, since 2×28227969² = 1593636467729922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28227961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1227292 + ... + 1227314.

Almost surely, 2^28227969 is an apocalyptic number.

28227969 is the 5313-rd square number.

28227969 is the 2657-th centered octagonal number.

It is an amenable number.

28227969 is a deficient number, since it is larger than the sum of its proper divisors (26271840).

28227969 is a wasteful number, since it uses less digits than its factorization.

28227969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 44 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The cubic root of 28227969 is about 304.4807756393.

The spelling of 28227969 in words is "twenty-eight million, two hundred twenty-seven thousand, nine hundred sixty-nine".