678777 has 16 divisors (see below), whose sum is σ = 1005312. Its totient is φ = 403920.

The previous prime is 678773. The next prime is 678779. The reversal of 678777 is 777876.

It is not a de Polignac number, because 678777 - 2² = 678773 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 15 ways as a sum of consecutive naturals, for example, 2058 + ... + 2364.

It is an arithmetic number, because the mean of its divisors is an integer number (62832).

2⁶⁷⁸⁷⁷⁷ is an apocalyptic number.

678777 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

678777 is a deficient number, since it is larger than the sum of its proper divisors (326535).

678777 is a wasteful number, since it uses less digits than its factorization.

678777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388.

The product of its digits is 115248, while the sum is 42.

The square root of 678777 is about 823.8792387237. The cubic root of 678777 is about 87.8838429562.

Subtracting 678777 from its reverse (777876), we obtain a palindrome (99099).

The spelling of 678777 in words is "six hundred seventy-eight thousand, seven hundred seventy-seven".