28566769 has 24 divisors (see below), whose sum is σ = 37154880. Its totient is φ = 21473760.

The previous prime is 28566767. The next prime is 28566793. The reversal of 28566769 is 96766582.

It is a happy number.

It is not a de Polignac number, because 28566769 - 2¹ = 28566767 is a prime.

It is a super-2 number, since 2×28566769² = 1632120582198722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28566761) 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, 23982 + ... + 25144.

It is an arithmetic number, because the mean of its divisors is an integer number (1548120).

Almost surely, 2^28566769 is an apocalyptic number.

28566769 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28566769 is a deficient number, since it is larger than the sum of its proper divisors (8588111).

28566769 is a wasteful number, since it uses less digits than its factorization.

28566769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221 (or 1210 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 49.

The square root of 28566769 is about 5344.7889574800. The cubic root of 28566769 is about 305.6940888857.

The spelling of 28566769 in words is "twenty-eight million, five hundred sixty-six thousand, seven hundred sixty-nine".