678943908386 has 8 divisors (see below), whose sum is σ = 1018942726044. Its totient is φ = 339296333040.

The previous prime is 678943908373. The next prime is 678943908397. The reversal of 678943908386 is 683809349876.

It can be written as a sum of positive squares in 2 ways, for example, as 555405015025 + 123538893361 = 745255^2 + 351481^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×678943908386² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87805745 + ... + 87813476.

Almost surely, 2^678943908386 is an apocalyptic number.

678943908386 is a deficient number, since it is larger than the sum of its proper divisors (339998817658).

678943908386 is a wasteful number, since it uses less digits than its factorization.

678943908386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175621156.

The product of its (nonzero) digits is 376233984, while the sum is 71.

The spelling of 678943908386 in words is "six hundred seventy-eight billion, nine hundred forty-three million, nine hundred eight thousand, three hundred eighty-six".