678571 has 4 divisors (see below), whose sum is σ = 702000. Its totient is φ = 655144.

The previous prime is 678563. The next prime is 678577. The reversal of 678571 is 175876.

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 678571 - 2³ = 678563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678577) 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 3 ways as a sum of consecutive naturals, for example, 11671 + ... + 11728.

It is an arithmetic number, because the mean of its divisors is an integer number (175500).

2⁶⁷⁸⁵⁷¹ is an apocalyptic number.

678571 is a deficient number, since it is larger than the sum of its proper divisors (23429).

678571 is a wasteful number, since it uses less digits than its factorization.

678571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23428.

The product of its digits is 11760, while the sum is 34.

The square root of 678571 is about 823.7542109149. The cubic root of 678571 is about 87.8749515218.

The spelling of 678571 in words is "six hundred seventy-eight thousand, five hundred seventy-one".