77999863 has 2 divisors, whose sum is σ = 77999864. Its totient is φ = 77999862.

The previous prime is 77999849. The next prime is 77999869. The reversal of 77999863 is 36899977.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77999863 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77999798 and 77999807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77999869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38999931 + 38999932.

It is an arithmetic number, because the mean of its divisors is an integer number (38999932).

Almost surely, 2^77999863 is an apocalyptic number.

77999863 is a deficient number, since it is larger than the sum of its proper divisors (1).

77999863 is an equidigital number, since it uses as much as digits as its factorization.

77999863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5143824, while the sum is 58.

The square root of 77999863 is about 8831.7531102268. The cubic root of 77999863 is about 427.2656180183.

The spelling of 77999863 in words is "seventy-seven million, nine hundred ninety-nine thousand, eight hundred sixty-three".