28117769 has 2 divisors, whose sum is σ = 28117770. Its totient is φ = 28117768.

The previous prime is 28117717. The next prime is 28117783. The reversal of 28117769 is 96771182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17749369 + 10368400 = 4213^2 + 3220^2 .

It is a cyclic number.

It is not a de Polignac number, because 28117769 - 2²⁰ = 27069193 is a prime.

It is a super-2 number, since 2×28117769² = 1581217867074722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28119769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14058884 + 14058885.

It is an arithmetic number, because the mean of its divisors is an integer number (14058885).

Almost surely, 2^28117769 is an apocalyptic number.

It is an amenable number.

28117769 is a deficient number, since it is larger than the sum of its proper divisors (1).

28117769 is an equidigital number, since it uses as much as digits as its factorization.

28117769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 41.

The square root of 28117769 is about 5302.6190698560. The cubic root of 28117769 is about 304.0840350840.

The spelling of 28117769 in words is "twenty-eight million, one hundred seventeen thousand, seven hundred sixty-nine".