76806409 has 2 divisors, whose sum is σ = 76806410. Its totient is φ = 76806408.

The previous prime is 76806397. The next prime is 76806427. The reversal of 76806409 is 90460867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66585600 + 10220809 = 8160^2 + 3197^2 .

It is a cyclic number.

It is not a de Polignac number, because 76806409 - 2¹³ = 76798217 is a prime.

It is a zygodrome in base 8.

It is not a weakly prime, because it can be changed into another prime (76806449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38403204 + 38403205.

It is an arithmetic number, because the mean of its divisors is an integer number (38403205).

Almost surely, 2^76806409 is an apocalyptic number.

It is an amenable number.

76806409 is a deficient number, since it is larger than the sum of its proper divisors (1).

76806409 is an equidigital number, since it uses as much as digits as its factorization.

76806409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 76806409 is about 8763.9265743159. The cubic root of 76806409 is about 425.0752512656.

The spelling of 76806409 in words is "seventy-six million, eight hundred six thousand, four hundred nine".