678464869 has 2 divisors, whose sum is σ = 678464870. Its totient is φ = 678464868.

The previous prime is 678464867. The next prime is 678464903. The reversal of 678464869 is 968464876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 463842369 + 214622500 = 21537^2 + 14650^2 .

It is a cyclic number.

It is not a de Polignac number, because 678464869 - 2¹ = 678464867 is a prime.

It is a super-2 number, since 2×678464869² = 920629156934374322, which contains 22 as substring.

Together with 678464867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678464867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339232434 + 339232435.

It is an arithmetic number, because the mean of its divisors is an integer number (339232435).

Almost surely, 2^678464869 is an apocalyptic number.

It is an amenable number.

678464869 is a deficient number, since it is larger than the sum of its proper divisors (1).

678464869 is an equidigital number, since it uses as much as digits as its factorization.

678464869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13934592, while the sum is 58.

The square root of 678464869 is about 26047.3581961780. The cubic root of 678464869 is about 878.7036996110.

The spelling of 678464869 in words is "six hundred seventy-eight million, four hundred sixty-four thousand, eight hundred sixty-nine".