77123857 has 2 divisors, whose sum is σ = 77123858. Its totient is φ = 77123856.

The previous prime is 77123833. The next prime is 77123863. The reversal of 77123857 is 75832177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57017601 + 20106256 = 7551^2 + 4484^2 .

It is a cyclic number.

It is not a de Polignac number, because 77123857 - 2⁷ = 77123729 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77123887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38561928 + 38561929.

It is an arithmetic number, because the mean of its divisors is an integer number (38561929).

Almost surely, 2^77123857 is an apocalyptic number.

It is an amenable number.

77123857 is a deficient number, since it is larger than the sum of its proper divisors (1).

77123857 is an equidigital number, since it uses as much as digits as its factorization.

77123857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82320, while the sum is 40.

The square root of 77123857 is about 8782.0189592143. The cubic root of 77123857 is about 425.6600714227.

The spelling of 77123857 in words is "seventy-seven million, one hundred twenty-three thousand, eight hundred fifty-seven".