678619477 has 2 divisors, whose sum is σ = 678619478. Its totient is φ = 678619476.

The previous prime is 678619433. The next prime is 678619603. The reversal of 678619477 is 774916876.

678619477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 501356881 + 177262596 = 22391^2 + 13314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678619477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678619427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339309738 + 339309739.

It is an arithmetic number, because the mean of its divisors is an integer number (339309739).

Almost surely, 2^678619477 is an apocalyptic number.

It is an amenable number.

678619477 is a deficient number, since it is larger than the sum of its proper divisors (1).

678619477 is an equidigital number, since it uses as much as digits as its factorization.

678619477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 55.

The square root of 678619477 is about 26050.3258520887. The cubic root of 678619477 is about 878.7704406267.

The spelling of 678619477 in words is "six hundred seventy-eight million, six hundred nineteen thousand, four hundred seventy-seven".