678644361 has 12 divisors (see below), whose sum is σ = 1003061488. Its totient is φ = 441907704.

The previous prime is 678644359. The next prime is 678644377. The reversal of 678644361 is 163446876.

It is a happy number.

It is not a de Polignac number, because 678644361 - 2¹ = 678644359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678644381) 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 in 11 ways as a sum of consecutive naturals, for example, 876415 + ... + 877188.

Almost surely, 2^678644361 is an apocalyptic number.

It is an amenable number.

678644361 is a deficient number, since it is larger than the sum of its proper divisors (324417127).

678644361 is a wasteful number, since it uses less digits than its factorization.

678644361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753652 (or 1753649 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 678644361 is about 26050.8034616977. The cubic root of 678644361 is about 878.7811815781.

The spelling of 678644361 in words is "six hundred seventy-eight million, six hundred forty-four thousand, three hundred sixty-one".