66858738 has 8 divisors (see below), whose sum is σ = 133717488. Its totient is φ = 22286244.

The previous prime is 66858731. The next prime is 66858749. The reversal of 66858738 is 83785866.

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

66858738 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (66858731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5571556 + ... + 5571567.

It is an arithmetic number, because the mean of its divisors is an integer number (16714686).

Almost surely, 2^66858738 is an apocalyptic number.

66858738 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66858738 is a wasteful number, since it uses less digits than its factorization.

66858738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11143128.

The product of its digits is 1935360, while the sum is 51.

The square root of 66858738 is about 8176.7192687532. The cubic root of 66858738 is about 405.8691652164.

The spelling of 66858738 in words is "sixty-six million, eight hundred fifty-eight thousand, seven hundred thirty-eight".