678738 has 8 divisors (see below), whose sum is σ = 1357488. Its totient is φ = 226244.

The previous prime is 678731. The next prime is 678739. The reversal of 678738 is 837876.

678738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

678738 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 678696 and 678705.

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, 56556 + ... + 56567.

It is an arithmetic number, because the mean of its divisors is an integer number (169686).

2⁶⁷⁸⁷³⁸ is an apocalyptic number.

678738 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678738 is a wasteful number, since it uses less digits than its factorization.

678738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113128.

The product of its digits is 56448, while the sum is 39.

The square root of 678738 is about 823.8555698665. The cubic root of 678738 is about 87.8821597644.

The spelling of 678738 in words is "six hundred seventy-eight thousand, seven hundred thirty-eight".