678740 has 12 divisors (see below), whose sum is σ = 1425396. Its totient is φ = 271488.

The previous prime is 678739. The next prime is 678749. The reversal of 678740 is 47876.

678740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 515524 + 163216 = 718^2 + 404^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 678697 and 678706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678749) 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, 16949 + ... + 16988.

It is an arithmetic number, because the mean of its divisors is an integer number (118783).

2⁶⁷⁸⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

678740 is an abundant number, since it is smaller than the sum of its proper divisors (746656).

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

678740 is a wasteful number, since it uses less digits than its factorization.

678740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33946 (or 33944 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 678740 is about 823.8567836706. The cubic root of 678740 is about 87.8822460835.

The spelling of 678740 in words is "six hundred seventy-eight thousand, seven hundred forty".