66723912 has 112 divisors (see below), whose sum is σ = 198904140. Its totient is φ = 20901888.

The previous prime is 66723911. The next prime is 66723941. The reversal of 66723912 is 21932766.

It can be written as a sum of positive squares in 2 ways, for example, as 66487716 + 236196 = 8154^2 + 486^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (66723911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 98808 + ... + 99480.

Almost surely, 2^66723912 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 66723912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99452070).

66723912 is an abundant number, since it is smaller than the sum of its proper divisors (132180228).

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

66723912 is a wasteful number, since it uses less digits than its factorization.

66723912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714 (or 695 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 66723912 is about 8168.4706034851. The cubic root of 66723912 is about 405.5961590617.

The spelling of 66723912 in words is "sixty-six million, seven hundred twenty-three thousand, nine hundred twelve".