77379779 has 2 divisors, whose sum is σ = 77379780. Its totient is φ = 77379778.

The previous prime is 77379773. The next prime is 77379793. The reversal of 77379779 is 97797377.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77379779 - 2⁴ = 77379763 is a prime.

It is not a weakly prime, because it can be changed into another prime (77379773) 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, 38689889 + 38689890.

It is an arithmetic number, because the mean of its divisors is an integer number (38689890).

Almost surely, 2^77379779 is an apocalyptic number.

77379779 is a deficient number, since it is larger than the sum of its proper divisors (1).

77379779 is an equidigital number, since it uses as much as digits as its factorization.

77379779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4084101, while the sum is 56.

The square root of 77379779 is about 8796.5776868052. The cubic root of 77379779 is about 426.1303777063.

The spelling of 77379779 in words is "seventy-seven million, three hundred seventy-nine thousand, seven hundred seventy-nine".