66871730 has 8 divisors (see below), whose sum is σ = 120369132. Its totient is φ = 26748688.

The previous prime is 66871729. The next prime is 66871747. The reversal of 66871730 is 3717866.

It can be written as a sum of positive squares in 2 ways, for example, as 62236321 + 4635409 = 7889^2 + 2153^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3343577 + ... + 3343596.

Almost surely, 2^66871730 is an apocalyptic number.

66871730 is a deficient number, since it is larger than the sum of its proper divisors (53497402).

66871730 is a wasteful number, since it uses less digits than its factorization.

66871730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6687180.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 66871730 is about 8177.5136808201. The cubic root of 66871730 is about 405.8954530328.

The spelling of 66871730 in words is "sixty-six million, eight hundred seventy-one thousand, seven hundred thirty".