678044357 has 2 divisors, whose sum is σ = 678044358. Its totient is φ = 678044356.

The previous prime is 678044293. The next prime is 678044383. The reversal of 678044357 is 753440876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644855236 + 33189121 = 25394^2 + 5761^2 .

It is a cyclic number.

It is not a de Polignac number, because 678044357 - 2⁶ = 678044293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678044387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339022178 + 339022179.

It is an arithmetic number, because the mean of its divisors is an integer number (339022179).

Almost surely, 2^678044357 is an apocalyptic number.

It is an amenable number.

678044357 is a deficient number, since it is larger than the sum of its proper divisors (1).

678044357 is an equidigital number, since it uses as much as digits as its factorization.

678044357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 44.

The square root of 678044357 is about 26039.2848788134. The cubic root of 678044357 is about 878.5221221346.

The spelling of 678044357 in words is "six hundred seventy-eight million, forty-four thousand, three hundred fifty-seven".