77768507 has 2 divisors, whose sum is σ = 77768508. Its totient is φ = 77768506.

The previous prime is 77768477. The next prime is 77768527. The reversal of 77768507 is 70586777.

It is a strong prime.

It is an emirp because it is prime and its reverse (70586777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77768507 - 2²⁰ = 76719931 is a prime.

It is not a weakly prime, because it can be changed into another prime (77768527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38884253 + 38884254.

It is an arithmetic number, because the mean of its divisors is an integer number (38884254).

Almost surely, 2^77768507 is an apocalyptic number.

77768507 is a deficient number, since it is larger than the sum of its proper divisors (1).

77768507 is an equidigital number, since it uses as much as digits as its factorization.

77768507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576240, while the sum is 47.

The square root of 77768507 is about 8818.6454175230. The cubic root of 77768507 is about 426.8427610388.

The spelling of 77768507 in words is "seventy-seven million, seven hundred sixty-eight thousand, five hundred seven".