6660730 has 8 divisors (see below), whose sum is σ = 11989332. Its totient is φ = 2664288.

The previous prime is 6660721. The next prime is 6660733. The reversal of 6660730 is 370666.

It can be written as a sum of positive squares in 2 ways, for example, as 6620329 + 40401 = 2573^2 + 201^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6660733) 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, 333027 + ... + 333046.

Almost surely, 2^6660730 is an apocalyptic number.

6660730 is a deficient number, since it is larger than the sum of its proper divisors (5328602).

6660730 is a wasteful number, since it uses less digits than its factorization.

6660730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666080.

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

The square root of 6660730 is about 2580.8390108645. The cubic root of 6660730 is about 188.1513230128.

Subtracting from 6660730 its reverse (370666), we obtain a square (6290064 = 2508²).

The spelling of 6660730 in words is "six million, six hundred sixty thousand, seven hundred thirty".