77693857 has 2 divisors, whose sum is σ = 77693858. Its totient is φ = 77693856.

The previous prime is 77693797. The next prime is 77693899. The reversal of 77693857 is 75839677.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51897616 + 25796241 = 7204^2 + 5079^2 .

It is a cyclic number.

It is not a de Polignac number, because 77693857 - 2¹⁹ = 77169569 is a prime.

It is not a weakly prime, because it can be changed into another prime (77693557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38846928 + 38846929.

It is an arithmetic number, because the mean of its divisors is an integer number (38846929).

Almost surely, 2^77693857 is an apocalyptic number.

It is an amenable number.

77693857 is a deficient number, since it is larger than the sum of its proper divisors (1).

77693857 is an equidigital number, since it uses as much as digits as its factorization.

77693857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2222640, while the sum is 52.

The square root of 77693857 is about 8814.4118918961. The cubic root of 77693857 is about 426.7061418419.

The spelling of 77693857 in words is "seventy-seven million, six hundred ninety-three thousand, eight hundred fifty-seven".