666730 has 16 divisors (see below), whose sum is σ = 1220904. Its totient is φ = 262080.

The previous prime is 666727. The next prime is 666733. The reversal of 666730 is 37666.

666730 is nontrivially palindromic in base 3.

It is an interprime number because it is at equal distance from previous prime (666727) and next prime (666733).

It can be written as a sum of positive squares in 4 ways, for example, as 549081 + 117649 = 741^2 + 343^2 .

It is not an unprimeable number, because it can be changed into a prime (666733) 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, 64 + ... + 1156.

2⁶⁶⁶⁷³⁰ is an apocalyptic number.

666730 is a deficient number, since it is larger than the sum of its proper divisors (554174).

666730 is a wasteful number, since it uses less digits than its factorization.

666730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 666730 is about 816.5353635943. The cubic root of 666730 is about 87.3608127242.

The spelling of 666730 in words is "six hundred sixty-six thousand, seven hundred thirty".