678999743 has 2 divisors, whose sum is σ = 678999744. Its totient is φ = 678999742.

The previous prime is 678999731. The next prime is 678999757. The reversal of 678999743 is 347999876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678999743 - 2⁶ = 678999679 is a prime.

It is a super-2 number, since 2×678999743² = 922081301988132098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678999773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339499871 + 339499872.

It is an arithmetic number, because the mean of its divisors is an integer number (339499872).

Almost surely, 2^678999743 is an apocalyptic number.

678999743 is a deficient number, since it is larger than the sum of its proper divisors (1).

678999743 is an equidigital number, since it uses as much as digits as its factorization.

678999743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20575296, while the sum is 62.

The square root of 678999743 is about 26057.6235102129. The cubic root of 678999743 is about 878.9345503299.

The spelling of 678999743 in words is "six hundred seventy-eight million, nine hundred ninety-nine thousand, seven hundred forty-three".