28168807 has 2 divisors, whose sum is σ = 28168808. Its totient is φ = 28168806.

The previous prime is 28168787. The next prime is 28168823. The reversal of 28168807 is 70886182.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28168807 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28168807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28160807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14084403 + 14084404.

It is an arithmetic number, because the mean of its divisors is an integer number (14084404).

Almost surely, 2^28168807 is an apocalyptic number.

28168807 is a deficient number, since it is larger than the sum of its proper divisors (1).

28168807 is an equidigital number, since it uses as much as digits as its factorization.

28168807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 28168807 is about 5307.4294154515. The cubic root of 28168807 is about 304.2679100345.

The spelling of 28168807 in words is "twenty-eight million, one hundred sixty-eight thousand, eight hundred seven".