678504949 has 2 divisors, whose sum is σ = 678504950. Its totient is φ = 678504948.

The previous prime is 678504917. The next prime is 678504961. The reversal of 678504949 is 949405876.

It is a happy number.

678504949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 465782724 + 212722225 = 21582^2 + 14585^2 .

It is a cyclic number.

It is not a de Polignac number, because 678504949 - 2⁵ = 678504917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678504896 and 678504905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678508949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339252474 + 339252475.

It is an arithmetic number, because the mean of its divisors is an integer number (339252475).

Almost surely, 2^678504949 is an apocalyptic number.

It is an amenable number.

678504949 is a deficient number, since it is larger than the sum of its proper divisors (1).

678504949 is an equidigital number, since it uses as much as digits as its factorization.

678504949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 678504949 is about 26048.1275526668. The cubic root of 678504949 is about 878.7210022759.

The spelling of 678504949 in words is "six hundred seventy-eight million, five hundred four thousand, nine hundred forty-nine".