76997857 has 2 divisors, whose sum is σ = 76997858. Its totient is φ = 76997856.

The previous prime is 76997827. The next prime is 76997873. The reversal of 76997857 is 75879967.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54302161 + 22695696 = 7369^2 + 4764^2 .

It is a cyclic number.

It is not a de Polignac number, because 76997857 - 2²³ = 68609249 is a prime.

It is not a weakly prime, because it can be changed into another prime (76997827) 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, 38498928 + 38498929.

It is an arithmetic number, because the mean of its divisors is an integer number (38498929).

Almost surely, 2^76997857 is an apocalyptic number.

It is an amenable number.

76997857 is a deficient number, since it is larger than the sum of its proper divisors (1).

76997857 is an equidigital number, since it uses as much as digits as its factorization.

76997857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6667920, while the sum is 58.

The square root of 76997857 is about 8774.8422777848. The cubic root of 76997857 is about 425.4281397175.

The spelling of 76997857 in words is "seventy-six million, nine hundred ninety-seven thousand, eight hundred fifty-seven".