678771 has 12 divisors (see below), whose sum is σ = 999648. Its totient is φ = 443664.

The previous prime is 678767. The next prime is 678773. The reversal of 678771 is 177876.

It is not a de Polignac number, because 678771 - 2² = 678767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (678773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235 + ... + 1188.

It is an arithmetic number, because the mean of its divisors is an integer number (83304).

2⁶⁷⁸⁷⁷¹ is an apocalyptic number.

678771 is a deficient number, since it is larger than the sum of its proper divisors (320877).

678771 is a wasteful number, since it uses less digits than its factorization.

678771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482 (or 1479 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 678771 is about 823.8755974053. The cubic root of 678771 is about 87.8835840078.

The spelling of 678771 in words is "six hundred seventy-eight thousand, seven hundred seventy-one".