678730 has 32 divisors (see below), whose sum is σ = 1378944. Its totient is φ = 238656.

The previous prime is 678721. The next prime is 678731. The reversal of 678730 is 37876.

678730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 678692 and 678701.

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 15 ways as a sum of consecutive naturals, for example, 2877 + ... + 3103.

It is an arithmetic number, because the mean of its divisors is an integer number (43092).

2⁶⁷⁸⁷³⁰ is an apocalyptic number.

678730 is an abundant number, since it is smaller than the sum of its proper divisors (700214).

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

678730 is a wasteful number, since it uses less digits than its factorization.

678730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 678730 is about 823.8507146322. The cubic root of 678730 is about 87.8818144864.

The spelling of 678730 in words is "six hundred seventy-eight thousand, seven hundred thirty".