77868793 has 2 divisors, whose sum is σ = 77868794. Its totient is φ = 77868792.

The previous prime is 77868767. The next prime is 77868797. The reversal of 77868793 is 39786877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76685049 + 1183744 = 8757^2 + 1088^2 .

It is a cyclic number.

It is not a de Polignac number, because 77868793 - 2⁹ = 77868281 is a prime.

It is not a weakly prime, because it can be changed into another prime (77868797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38934396 + 38934397.

It is an arithmetic number, because the mean of its divisors is an integer number (38934397).

Almost surely, 2^77868793 is an apocalyptic number.

It is an amenable number.

77868793 is a deficient number, since it is larger than the sum of its proper divisors (1).

77868793 is an equidigital number, since it uses as much as digits as its factorization.

77868793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 55.

The square root of 77868793 is about 8824.3296062647. The cubic root of 77868793 is about 427.0261598966.

The spelling of 77868793 in words is "seventy-seven million, eight hundred sixty-eight thousand, seven hundred ninety-three".