66730706 has 16 divisors (see below), whose sum is σ = 116272320. Its totient is φ = 28129680.

The previous prime is 66730691. The next prime is 66730709. The reversal of 66730706 is 60703766.

It is a super-3 number, since 3×66730706³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66730709) 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, 38216 + ... + 39923.

It is an arithmetic number, because the mean of its divisors is an integer number (7267020).

Almost surely, 2^66730706 is an apocalyptic number.

66730706 is a deficient number, since it is larger than the sum of its proper divisors (49541614).

66730706 is a wasteful number, since it uses less digits than its factorization.

66730706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78209.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 66730706 is about 8168.8864602221. The cubic root of 66730706 is about 405.6099248752.

The spelling of 66730706 in words is "sixty-six million, seven hundred thirty thousand, seven hundred six".