678706123 has 2 divisors, whose sum is σ = 678706124. Its totient is φ = 678706122.

The previous prime is 678706073. The next prime is 678706139. The reversal of 678706123 is 321607876.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678706123 is a prime.

It is a super-2 number, since 2×678706123² = 921284002795382258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (678706183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339353061 + 339353062.

It is an arithmetic number, because the mean of its divisors is an integer number (339353062).

Almost surely, 2^678706123 is an apocalyptic number.

678706123 is a deficient number, since it is larger than the sum of its proper divisors (1).

678706123 is an equidigital number, since it uses as much as digits as its factorization.

678706123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 678706123 is about 26051.9888492222. The cubic root of 678706123 is about 878.8078394468.

The spelling of 678706123 in words is "six hundred seventy-eight million, seven hundred six thousand, one hundred twenty-three".