77308769 has 2 divisors, whose sum is σ = 77308770. Its totient is φ = 77308768.

The previous prime is 77308757. The next prime is 77308783. The reversal of 77308769 is 96780377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75916369 + 1392400 = 8713^2 + 1180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77308769 is a prime.

It is a super-2 number, since 2×77308769² = 11953291528590722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77308729) 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, 38654384 + 38654385.

It is an arithmetic number, because the mean of its divisors is an integer number (38654385).

Almost surely, 2^77308769 is an apocalyptic number.

It is an amenable number.

77308769 is a deficient number, since it is larger than the sum of its proper divisors (1).

77308769 is an equidigital number, since it uses as much as digits as its factorization.

77308769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 77308769 is about 8792.5405316097. The cubic root of 77308769 is about 425.9999871425. Note that the first 4 decimals are identical.

The spelling of 77308769 in words is "seventy-seven million, three hundred eight thousand, seven hundred sixty-nine".