678626863 has 2 divisors, whose sum is σ = 678626864. Its totient is φ = 678626862.

The previous prime is 678626813. The next prime is 678626899. The reversal of 678626863 is 368626876.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 678626863 - 2¹³ = 678618671 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 678626863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678626813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339313431 + 339313432.

It is an arithmetic number, because the mean of its divisors is an integer number (339313432).

Almost surely, 2^678626863 is an apocalyptic number.

678626863 is a deficient number, since it is larger than the sum of its proper divisors (1).

678626863 is an equidigital number, since it uses as much as digits as its factorization.

678626863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 52.

The square root of 678626863 is about 26050.4676157646. The cubic root of 678626863 is about 878.7736287536.

The spelling of 678626863 in words is "six hundred seventy-eight million, six hundred twenty-six thousand, eight hundred sixty-three".