678725863 has 2 divisors, whose sum is σ = 678725864. Its totient is φ = 678725862.

The previous prime is 678725851. The next prime is 678725881. The reversal of 678725863 is 368527876.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678725863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 678725863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678725363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339362931 + 339362932.

It is an arithmetic number, because the mean of its divisors is an integer number (339362932).

Almost surely, 2^678725863 is an apocalyptic number.

678725863 is a deficient number, since it is larger than the sum of its proper divisors (1).

678725863 is an equidigital number, since it uses as much as digits as its factorization.

678725863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 52.

The square root of 678725863 is about 26052.3677042990. The cubic root of 678725863 is about 878.8163593339.

The spelling of 678725863 in words is "six hundred seventy-eight million, seven hundred twenty-five thousand, eight hundred sixty-three".