76823809 has 2 divisors, whose sum is σ = 76823810. Its totient is φ = 76823808.

The previous prime is 76823801. The next prime is 76823819. The reversal of 76823809 is 90832867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75742209 + 1081600 = 8703^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 76823809 - 2³ = 76823801 is a prime.

It is not a weakly prime, because it can be changed into another prime (76823801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38411904 + 38411905.

It is an arithmetic number, because the mean of its divisors is an integer number (38411905).

Almost surely, 2^76823809 is an apocalyptic number.

It is an amenable number.

76823809 is a deficient number, since it is larger than the sum of its proper divisors (1).

76823809 is an equidigital number, since it uses as much as digits as its factorization.

76823809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 76823809 is about 8764.9192238149. The cubic root of 76823809 is about 425.1073482005.

The spelling of 76823809 in words is "seventy-six million, eight hundred twenty-three thousand, eight hundred nine".