678334049 has 2 divisors, whose sum is σ = 678334050. Its totient is φ = 678334048.

The previous prime is 678334037. The next prime is 678334057. The reversal of 678334049 is 940433876.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670810000 + 7524049 = 25900^2 + 2743^2 .

It is a cyclic number.

It is not a de Polignac number, because 678334049 - 2²⁰ = 677285473 is a prime.

It is not a weakly prime, because it can be changed into another prime (678334249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339167024 + 339167025.

It is an arithmetic number, because the mean of its divisors is an integer number (339167025).

Almost surely, 2^678334049 is an apocalyptic number.

It is an amenable number.

678334049 is a deficient number, since it is larger than the sum of its proper divisors (1).

678334049 is an equidigital number, since it uses as much as digits as its factorization.

678334049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 678334049 is about 26044.8468799492. The cubic root of 678334049 is about 878.6472194540.

The spelling of 678334049 in words is "six hundred seventy-eight million, three hundred thirty-four thousand, forty-nine".