678881 has 8 divisors (see below), whose sum is σ = 780864. Its totient is φ = 578160.

The previous prime is 678871. The next prime is 678883. The reversal of 678881 is 188876.

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

It is a cyclic number.

It is not a de Polignac number, because 678881 - 2¹⁰ = 677857 is a prime.

It is a super-2 number, since 2×678881² = 921758824322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (678883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1886 + ... + 2216.

It is an arithmetic number, because the mean of its divisors is an integer number (97608).

2⁶⁷⁸⁸⁸¹ is an apocalyptic number.

It is an amenable number.

678881 is a deficient number, since it is larger than the sum of its proper divisors (101983).

678881 is a wasteful number, since it uses less digits than its factorization.

678881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631.

The product of its digits is 21504, while the sum is 38.

The square root of 678881 is about 823.9423523524. The cubic root of 678881 is about 87.8883311523. Note that the first 3 decimals are identical.

It can be divided in two parts, 6 and 78881, that added together give a palindrome (78887).

The spelling of 678881 in words is "six hundred seventy-eight thousand, eight hundred eighty-one".