66728334 has 8 divisors (see below), whose sum is σ = 133456680. Its totient is φ = 22242776.

The previous prime is 66728329. The next prime is 66728339. The reversal of 66728334 is 43382766.

It is an interprime number because it is at equal distance from previous prime (66728329) and next prime (66728339).

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

66728334 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 66728292 and 66728301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66728339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5560689 + ... + 5560700.

It is an arithmetic number, because the mean of its divisors is an integer number (16682085).

Almost surely, 2^66728334 is an apocalyptic number.

66728334 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.

66728334 is a wasteful number, since it uses less digits than its factorization.

66728334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11121394.

The product of its digits is 145152, while the sum is 39.

The square root of 66728334 is about 8168.7412739051. The cubic root of 66728334 is about 405.6051189010.

The spelling of 66728334 in words is "sixty-six million, seven hundred twenty-eight thousand, three hundred thirty-four".