678393497 has 2 divisors, whose sum is σ = 678393498. Its totient is φ = 678393496.

The previous prime is 678393431. The next prime is 678393581. The reversal of 678393497 is 794393876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 652342681 + 26050816 = 25541^2 + 5104^2 .

It is a cyclic number.

It is not a de Polignac number, because 678393497 - 2²⁴ = 661616281 is a prime.

It is not a weakly prime, because it can be changed into another prime (678393407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339196748 + 339196749.

It is an arithmetic number, because the mean of its divisors is an integer number (339196749).

Almost surely, 2^678393497 is an apocalyptic number.

It is an amenable number.

678393497 is a deficient number, since it is larger than the sum of its proper divisors (1).

678393497 is an equidigital number, since it uses as much as digits as its factorization.

678393497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 56.

The square root of 678393497 is about 26045.9881171746. The cubic root of 678393497 is about 878.6728864019.

The spelling of 678393497 in words is "six hundred seventy-eight million, three hundred ninety-three thousand, four hundred ninety-seven".