66724668 has 48 divisors (see below), whose sum is σ = 176268960. Its totient is φ = 21820032.

The previous prime is 66724663. The next prime is 66724687. The reversal of 66724668 is 86642766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66724663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105 + ... + 11552.

It is an arithmetic number, because the mean of its divisors is an integer number (3672270).

Almost surely, 2^66724668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66724668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88134480).

66724668 is an abundant number, since it is smaller than the sum of its proper divisors (109544292).

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

66724668 is a wasteful number, since it uses less digits than its factorization.

66724668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11723 (or 11715 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 66724668 is about 8168.5168788465. The cubic root of 66724668 is about 405.5976908940.

The spelling of 66724668 in words is "sixty-six million, seven hundred twenty-four thousand, six hundred sixty-eight".