28168769 has 2 divisors, whose sum is σ = 28168770. Its totient is φ = 28168768.

The previous prime is 28168759. The next prime is 28168771. The reversal of 28168769 is 96786182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25806400 + 2362369 = 5080^2 + 1537^2 .

It is a cyclic number.

It is not a de Polignac number, because 28168769 - 2⁸ = 28168513 is a prime.

It is a super-2 number, since 2×28168769² = 1586959093950722, which contains 22 as substring.

Together with 28168771, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28168709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14084384 + 14084385.

It is an arithmetic number, because the mean of its divisors is an integer number (14084385).

Almost surely, 2^28168769 is an apocalyptic number.

It is an amenable number.

28168769 is a deficient number, since it is larger than the sum of its proper divisors (1).

28168769 is an equidigital number, since it uses as much as digits as its factorization.

28168769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 28168769 is about 5307.4258355628. The cubic root of 28168769 is about 304.2677732143.

The spelling of 28168769 in words is "twenty-eight million, one hundred sixty-eight thousand, seven hundred sixty-nine".