77868797 has 2 divisors, whose sum is σ = 77868798. Its totient is φ = 77868796.

The previous prime is 77868793. The next prime is 77868803. The reversal of 77868797 is 79786877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77334436 + 534361 = 8794^2 + 731^2 .

It is an emirp because it is prime and its reverse (79786877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77868797 - 2² = 77868793 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77868793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38934398 + 38934399.

It is an arithmetic number, because the mean of its divisors is an integer number (38934399).

Almost surely, 2^77868797 is an apocalyptic number.

It is an amenable number.

77868797 is a deficient number, since it is larger than the sum of its proper divisors (1).

77868797 is an equidigital number, since it uses as much as digits as its factorization.

77868797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8297856, while the sum is 59.

The square root of 77868797 is about 8824.3298329108. The cubic root of 77868797 is about 427.0261672085.

The spelling of 77868797 in words is "seventy-seven million, eight hundred sixty-eight thousand, seven hundred ninety-seven".