77716589 has 2 divisors, whose sum is σ = 77716590. Its totient is φ = 77716588.

The previous prime is 77716579. The next prime is 77716591. The reversal of 77716589 is 98561777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77616100 + 100489 = 8810^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 77716589 - 2¹² = 77712493 is a prime.

Together with 77716591, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77716519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38858294 + 38858295.

It is an arithmetic number, because the mean of its divisors is an integer number (38858295).

Almost surely, 2^77716589 is an apocalyptic number.

It is an amenable number.

77716589 is a deficient number, since it is larger than the sum of its proper divisors (1).

77716589 is an equidigital number, since it uses as much as digits as its factorization.

77716589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 740880, while the sum is 50.

The square root of 77716589 is about 8815.7012766994. The cubic root of 77716589 is about 426.7477536181.

The spelling of 77716589 in words is "seventy-seven million, seven hundred sixteen thousand, five hundred eighty-nine".