678788 has 12 divisors (see below), whose sum is σ = 1295952. Its totient is φ = 308520.

The previous prime is 678779. The next prime is 678809. The reversal of 678788 is 887876.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 15427 = 678788 / (6 + 7 + 8 + 7 + 8 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7670 + ... + 7757.

It is an arithmetic number, because the mean of its divisors is an integer number (107996).

2⁶⁷⁸⁷⁸⁸ is an apocalyptic number.

It is an amenable number.

678788 is a deficient number, since it is larger than the sum of its proper divisors (617164).

678788 is a wasteful number, since it uses less digits than its factorization.

678788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15442 (or 15440 counting only the distinct ones).

The product of its digits is 150528, while the sum is 44.

The square root of 678788 is about 823.8859144323. The cubic root of 678788 is about 87.8843176909.

The spelling of 678788 in words is "six hundred seventy-eight thousand, seven hundred eighty-eight".