77699077 has 2 divisors, whose sum is σ = 77699078. Its totient is φ = 77699076.

The previous prime is 77699071. The next prime is 77699081. The reversal of 77699077 is 77099677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77422401 + 276676 = 8799^2 + 526^2 .

It is an emirp because it is prime and its reverse (77099677) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77699077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77699071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38849538 + 38849539.

It is an arithmetic number, because the mean of its divisors is an integer number (38849539).

Almost surely, 2^77699077 is an apocalyptic number.

It is an amenable number.

77699077 is a deficient number, since it is larger than the sum of its proper divisors (1).

77699077 is an equidigital number, since it uses as much as digits as its factorization.

77699077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166886, while the sum is 52.

The square root of 77699077 is about 8814.7079928946. The cubic root of 77699077 is about 426.7156979650.

The spelling of 77699077 in words is "seventy-seven million, six hundred ninety-nine thousand, seventy-seven".