678564893 has 2 divisors, whose sum is σ = 678564894. Its totient is φ = 678564892.

The previous prime is 678564847. The next prime is 678564949. The reversal of 678564893 is 398465876.

It is an a-pointer prime, because the next prime (678564949) can be obtained adding 678564893 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 649383289 + 29181604 = 25483^2 + 5402^2 .

It is a cyclic number.

It is not a de Polignac number, because 678564893 - 2⁶ = 678564829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678564493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339282446 + 339282447.

It is an arithmetic number, because the mean of its divisors is an integer number (339282447).

Almost surely, 2^678564893 is an apocalyptic number.

It is an amenable number.

678564893 is a deficient number, since it is larger than the sum of its proper divisors (1).

678564893 is an equidigital number, since it uses as much as digits as its factorization.

678564893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 56.

The square root of 678564893 is about 26049.2781665827. The cubic root of 678564893 is about 878.7468790219.

The spelling of 678564893 in words is "six hundred seventy-eight million, five hundred sixty-four thousand, eight hundred ninety-three".