77868379 has 2 divisors, whose sum is σ = 77868380. Its totient is φ = 77868378.

The previous prime is 77868353. The next prime is 77868383. The reversal of 77868379 is 97386877.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77868379 - 2¹¹ = 77866331 is a prime.

It is not a weakly prime, because it can be changed into another prime (77868079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38934189 + 38934190.

It is an arithmetic number, because the mean of its divisors is an integer number (38934190).

Almost surely, 2^77868379 is an apocalyptic number.

77868379 is a deficient number, since it is larger than the sum of its proper divisors (1).

77868379 is an equidigital number, since it uses as much as digits as its factorization.

77868379 is an odious number, because the sum of its binary digits is odd.

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

The square root of 77868379 is about 8824.3061483609. The cubic root of 77868379 is about 427.0254031144.

The spelling of 77868379 in words is "seventy-seven million, eight hundred sixty-eight thousand, three hundred seventy-nine".