76779979 has 2 divisors, whose sum is σ = 76779980. Its totient is φ = 76779978.

The previous prime is 76779977. The next prime is 76780001. The reversal of 76779979 is 97997767.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 76779979 - 2¹ = 76779977 is a prime.

Together with 76779977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (76779977) 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, 38389989 + 38389990.

It is an arithmetic number, because the mean of its divisors is an integer number (38389990).

Almost surely, 2^76779979 is an apocalyptic number.

76779979 is a deficient number, since it is larger than the sum of its proper divisors (1).

76779979 is an equidigital number, since it uses as much as digits as its factorization.

76779979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10501974, while the sum is 61.

The square root of 76779979 is about 8762.4185588227. The cubic root of 76779979 is about 425.0264878532.

The spelling of 76779979 in words is "seventy-six million, seven hundred seventy-nine thousand, nine hundred seventy-nine".