678395617834 has 24 divisors (see below), whose sum is σ = 1118810681604. Its totient is φ = 308279241600.

The previous prime is 678395617829. The next prime is 678395617871. The reversal of 678395617834 is 438716593876.

It can be written as a sum of positive squares in 2 ways, for example, as 677416240809 + 979377025 = 823053^2 + 31295^2 .

It is a super-2 number, since 2×678395617834² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 678395617834.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 537484 + ... + 1282840.

Almost surely, 2^678395617834 is an apocalyptic number.

678395617834 is a deficient number, since it is larger than the sum of its proper divisors (440415063770).

678395617834 is a wasteful number, since it uses less digits than its factorization.

678395617834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749142 (or 749131 counting only the distinct ones).

The product of its digits is 182891520, while the sum is 67.

The spelling of 678395617834 in words is "six hundred seventy-eight billion, three hundred ninety-five million, six hundred seventeen thousand, eight hundred thirty-four".