678420863 has 4 divisors (see below), whose sum is σ = 696756600. Its totient is φ = 660085128.

The previous prime is 678420851. The next prime is 678420877. The reversal of 678420863 is 368024876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678420863 - 2²² = 674226559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678420823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9167813 + ... + 9167886.

It is an arithmetic number, because the mean of its divisors is an integer number (174189150).

Almost surely, 2^678420863 is an apocalyptic number.

678420863 is a deficient number, since it is larger than the sum of its proper divisors (18335737).

678420863 is a wasteful number, since it uses less digits than its factorization.

678420863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18335736.

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 678420863 is about 26046.5134518999. The cubic root of 678420863 is about 878.6847012945.

The spelling of 678420863 in words is "six hundred seventy-eight million, four hundred twenty thousand, eight hundred sixty-three".