76985569 has 2 divisors, whose sum is σ = 76985570. Its totient is φ = 76985568.

The previous prime is 76985563. The next prime is 76985603. The reversal of 76985569 is 96558967.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73702225 + 3283344 = 8585^2 + 1812^2 .

It is a cyclic number.

It is not a de Polignac number, because 76985569 - 2⁹ = 76985057 is a prime.

It is a super-2 number, since 2×76985569² = 11853555668507522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (76985563) 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, 38492784 + 38492785.

It is an arithmetic number, because the mean of its divisors is an integer number (38492785).

Almost surely, 2^76985569 is an apocalyptic number.

It is an amenable number.

76985569 is a deficient number, since it is larger than the sum of its proper divisors (1).

76985569 is an equidigital number, since it uses as much as digits as its factorization.

76985569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4082400, while the sum is 55.

The square root of 76985569 is about 8774.1420663219. The cubic root of 76985569 is about 425.4055073166.

The spelling of 76985569 in words is "seventy-six million, nine hundred eighty-five thousand, five hundred sixty-nine".