76809569 has 2 divisors, whose sum is σ = 76809570. Its totient is φ = 76809568.

The previous prime is 76809559. The next prime is 76809613. The reversal of 76809569 is 96590867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75463969 + 1345600 = 8687^2 + 1160^2 .

It is an emirp because it is prime and its reverse (96590867) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76809569 - 2¹⁶ = 76744033 is a prime.

It is a super-2 number, since 2×76809569² = 11799419779931522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76809559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38404784 + 38404785.

It is an arithmetic number, because the mean of its divisors is an integer number (38404785).

Almost surely, 2^76809569 is an apocalyptic number.

It is an amenable number.

76809569 is a deficient number, since it is larger than the sum of its proper divisors (1).

76809569 is an equidigital number, since it uses as much as digits as its factorization.

76809569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 76809569 is about 8764.1068569478. The cubic root of 76809569 is about 425.0810807244.

The spelling of 76809569 in words is "seventy-six million, eight hundred nine thousand, five hundred sixty-nine".