668735 has 8 divisors (see below), whose sum is σ = 813120. Its totient is φ = 527904.

The previous prime is 668719. The next prime is 668737. The reversal of 668735 is 537866.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 668735 - 2⁴ = 668719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668695 and 668704.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452 + ... + 1241.

It is an arithmetic number, because the mean of its divisors is an integer number (101640).

2⁶⁶⁸⁷³⁵ is an apocalyptic number.

668735 is a deficient number, since it is larger than the sum of its proper divisors (144385).

668735 is a wasteful number, since it uses less digits than its factorization.

668735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777.

The product of its digits is 30240, while the sum is 35.

The square root of 668735 is about 817.7621903708. The cubic root of 668735 is about 87.4482959846.

The spelling of 668735 in words is "six hundred sixty-eight thousand, seven hundred thirty-five".