66630729 has 8 divisors (see below), whose sum is σ = 96917472. Its totient is φ = 40382240.

The previous prime is 66630709. The next prime is 66630743. The reversal of 66630729 is 92703666.

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 66630729 - 2⁷ = 66630601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66630709) 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, 1009524 + ... + 1009589.

It is an arithmetic number, because the mean of its divisors is an integer number (12114684).

Almost surely, 2^66630729 is an apocalyptic number.

It is an amenable number.

66630729 is a deficient number, since it is larger than the sum of its proper divisors (30286743).

66630729 is a wasteful number, since it uses less digits than its factorization.

66630729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019127.

The product of its (nonzero) digits is 81648, while the sum is 39.

The square root of 66630729 is about 8162.7647889670. The cubic root of 66630729 is about 405.4072598929.

The spelling of 66630729 in words is "sixty-six million, six hundred thirty thousand, seven hundred twenty-nine".