66628707 has 8 divisors (see below), whose sum is σ = 88978176. Its totient is φ = 44349192.

The previous prime is 66628691. The next prime is 66628733. The reversal of 66628707 is 70782666.

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

It is not a de Polignac number, because 66628707 - 2⁴ = 66628691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66621707) 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, 15223 + ... + 19104.

It is an arithmetic number, because the mean of its divisors is an integer number (11122272).

Almost surely, 2^66628707 is an apocalyptic number.

66628707 is a deficient number, since it is larger than the sum of its proper divisors (22349469).

66628707 is a wasteful number, since it uses less digits than its factorization.

66628707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34977.

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 66628707 is about 8162.6409329334. The cubic root of 66628707 is about 405.4031589734.

The spelling of 66628707 in words is "sixty-six million, six hundred twenty-eight thousand, seven hundred seven".