678564847 has 2 divisors, whose sum is σ = 678564848. Its totient is φ = 678564846.

The previous prime is 678564839. The next prime is 678564893. The reversal of 678564847 is 748465876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678564847 - 2³ = 678564839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678564827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339282423 + 339282424.

It is an arithmetic number, because the mean of its divisors is an integer number (339282424).

Almost surely, 2^678564847 is an apocalyptic number.

678564847 is a deficient number, since it is larger than the sum of its proper divisors (1).

678564847 is an equidigital number, since it uses as much as digits as its factorization.

678564847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9031680, while the sum is 55.

The square root of 678564847 is about 26049.2772836407. The cubic root of 678564847 is about 878.7468591651.

The spelling of 678564847 in words is "six hundred seventy-eight million, five hundred sixty-four thousand, eight hundred forty-seven".