678825349 has 2 divisors, whose sum is σ = 678825350. Its totient is φ = 678825348.

The previous prime is 678825337. The next prime is 678825353. The reversal of 678825349 is 943528876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490312449 + 188512900 = 22143^2 + 13730^2 .

It is a cyclic number.

It is not a de Polignac number, because 678825349 - 2⁷ = 678825221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678825296 and 678825305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678825319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339412674 + 339412675.

It is an arithmetic number, because the mean of its divisors is an integer number (339412675).

Almost surely, 2^678825349 is an apocalyptic number.

It is an amenable number.

678825349 is a deficient number, since it is larger than the sum of its proper divisors (1).

678825349 is an equidigital number, since it uses as much as digits as its factorization.

678825349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 52.

The square root of 678825349 is about 26054.2769809488. The cubic root of 678825349 is about 878.8592954969.

The spelling of 678825349 in words is "six hundred seventy-eight million, eight hundred twenty-five thousand, three hundred forty-nine".