28868769 has 12 divisors (see below), whose sum is σ = 42826836. Its totient is φ = 18725472.

The previous prime is 28868761. The next prime is 28868773. The reversal of 28868769 is 96786882.

It can be written as a sum of positive squares in 2 ways, for example, as 22212369 + 6656400 = 4713^2 + 2580^2 .

It is not a de Polignac number, because 28868769 - 2³ = 28868761 is a prime.

It is a super-2 number, since 2×28868769² = 1666811647150722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28868761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43014 + ... + 43679.

It is an arithmetic number, because the mean of its divisors is an integer number (3568903).

Almost surely, 2^28868769 is an apocalyptic number.

It is an amenable number.

28868769 is a deficient number, since it is larger than the sum of its proper divisors (13958067).

28868769 is a wasteful number, since it uses less digits than its factorization.

28868769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86736 (or 86733 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 28868769 is about 5372.9664990580. The cubic root of 28868769 is about 306.7675527923.

The spelling of 28868769 in words is "twenty-eight million, eight hundred sixty-eight thousand, seven hundred sixty-nine".