76779977 has 2 divisors, whose sum is σ = 76779978. Its totient is φ = 76779976.

The previous prime is 76779961. The next prime is 76779979. The reversal of 76779977 is 77997767.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72097081 + 4682896 = 8491^2 + 2164^2 .

It is a cyclic number.

It is not a de Polignac number, because 76779977 - 2⁴ = 76779961 is a prime.

Together with 76779979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76779979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38389988 + 38389989.

It is an arithmetic number, because the mean of its divisors is an integer number (38389989).

Almost surely, 2^76779977 is an apocalyptic number.

It is an amenable number.

76779977 is a deficient number, since it is larger than the sum of its proper divisors (1).

76779977 is an equidigital number, since it uses as much as digits as its factorization.

76779977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8168202, while the sum is 59.

The square root of 76779977 is about 8762.4184446989. The cubic root of 76779977 is about 425.0264841627.

The spelling of 76779977 in words is "seventy-six million, seven hundred seventy-nine thousand, nine hundred seventy-seven".