77778863 has 2 divisors, whose sum is σ = 77778864. Its totient is φ = 77778862.

The previous prime is 77778823. The next prime is 77778887. The reversal of 77778863 is 36887777.

It is a strong prime.

It is an emirp because it is prime and its reverse (36887777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77778863 - 2⁸ = 77778607 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77778823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38889431 + 38889432.

It is an arithmetic number, because the mean of its divisors is an integer number (38889432).

Almost surely, 2^77778863 is an apocalyptic number.

77778863 is a deficient number, since it is larger than the sum of its proper divisors (1).

77778863 is an equidigital number, since it uses as much as digits as its factorization.

77778863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2765952, while the sum is 53.

The square root of 77778863 is about 8819.2325629842. The cubic root of 77778863 is about 426.8617069575.

The spelling of 77778863 in words is "seventy-seven million, seven hundred seventy-eight thousand, eight hundred sixty-three".