678899 has 4 divisors (see below), whose sum is σ = 731136. Its totient is φ = 626664.

The previous prime is 678883. The next prime is 678901. The reversal of 678899 is 998876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678899 - 2⁴ = 678883 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (678809) 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 3 ways as a sum of consecutive naturals, for example, 26099 + ... + 26124.

It is an arithmetic number, because the mean of its divisors is an integer number (182784).

2⁶⁷⁸⁸⁹⁹ is an apocalyptic number.

678899 is a deficient number, since it is larger than the sum of its proper divisors (52237).

678899 is a wasteful number, since it uses less digits than its factorization.

678899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52236.

The product of its digits is 217728, while the sum is 47.

The square root of 678899 is about 823.9532753743. The cubic root of 678899 is about 87.8891079090.

The spelling of 678899 in words is "six hundred seventy-eight thousand, eight hundred ninety-nine".