28806761 has 2 divisors, whose sum is σ = 28806762. Its totient is φ = 28806760.

The previous prime is 28806737. The next prime is 28806779. The reversal of 28806761 is 16760882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16556761 + 12250000 = 4069^2 + 3500^2 .

It is a cyclic number.

It is not a de Polignac number, because 28806761 - 2⁶ = 28806697 is a prime.

It is a super-2 number, since 2×28806761² = 1659658958622242, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1788437 and since 28806761 and 1788437 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28806361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14403380 + 14403381.

It is an arithmetic number, because the mean of its divisors is an integer number (14403381).

Almost surely, 2^28806761 is an apocalyptic number.

It is an amenable number.

28806761 is a deficient number, since it is larger than the sum of its proper divisors (1).

28806761 is an equidigital number, since it uses as much as digits as its factorization.

28806761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28806761 is about 5367.1930280175. The cubic root of 28806761 is about 306.5477572755.

The spelling of 28806761 in words is "twenty-eight million, eight hundred six thousand, seven hundred sixty-one".