668730 has 16 divisors (see below), whose sum is σ = 1605024. Its totient is φ = 178320.

The previous prime is 668719. The next prime is 668737. The reversal of 668730 is 37866.

668730 is nontrivially palindromic in base 16.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 22291 = 668730 / (6 + 6 + 8 + 7 + 3 + 0).

It is a nialpdrome in base 15.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11116 + ... + 11175.

It is an arithmetic number, because the mean of its divisors is an integer number (100314).

2⁶⁶⁸⁷³⁰ is an apocalyptic number.

668730 is an abundant number, since it is smaller than the sum of its proper divisors (936294).

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

668730 is a wasteful number, since it uses less digits than its factorization.

668730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22301.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 668730 is about 817.7591332416. The cubic root of 668730 is about 87.4480780395.

The spelling of 668730 in words is "six hundred sixty-eight thousand, seven hundred thirty".