678736 has 20 divisors (see below), whose sum is σ = 1339200. Its totient is φ = 333152.

The previous prime is 678731. The next prime is 678739. The reversal of 678736 is 637876.

It is a junction number, because it is equal to n+sod(n) for n = 678695 and 678704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 585 + ... + 1303.

It is an arithmetic number, because the mean of its divisors is an integer number (66960).

2⁶⁷⁸⁷³⁶ is an apocalyptic number.

It is an amenable number.

678736 is a deficient number, since it is larger than the sum of its proper divisors (660464).

678736 is a wasteful number, since it uses less digits than its factorization.

678736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786 (or 780 counting only the distinct ones).

The product of its digits is 42336, while the sum is 37.

The square root of 678736 is about 823.8543560606. The cubic root of 678736 is about 87.8820734452.

The spelling of 678736 in words is "six hundred seventy-eight thousand, seven hundred thirty-six".