668734 has 16 divisors (see below), whose sum is σ = 1108080. Its totient is φ = 300160.

The previous prime is 668719. The next prime is 668737. The reversal of 668734 is 437866.

668734 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 668734.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668737) by changing a digit.

668734 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2352 + ... + 2620.

It is an arithmetic number, because the mean of its divisors is an integer number (69255).

2⁶⁶⁸⁷³⁴ is an apocalyptic number.

668734 is a deficient number, since it is larger than the sum of its proper divisors (439346).

668734 is a wasteful number, since it uses less digits than its factorization.

668734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395.

The product of its digits is 24192, while the sum is 34.

The square root of 668734 is about 817.7615789458. The cubic root of 668734 is about 87.4482523956.

The spelling of 668734 in words is "six hundred sixty-eight thousand, seven hundred thirty-four".