66726672 has 80 divisors (see below), whose sum is σ = 177280320. Its totient is φ = 21620736.

The previous prime is 66726661. The next prime is 66726677. The reversal of 66726672 is 27662766.

66726672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66726677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 479979 + ... + 480117.

It is an arithmetic number, because the mean of its divisors is an integer number (2216004).

Almost surely, 2^66726672 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 66726672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88640160).

66726672 is an abundant number, since it is smaller than the sum of its proper divisors (110553648).

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

66726672 is a wasteful number, since it uses less digits than its factorization.

66726672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 354 counting only the distinct ones).

The product of its digits is 254016, while the sum is 42.

The square root of 66726672 is about 8168.6395440122. The cubic root of 66726672 is about 405.6017514095.

The spelling of 66726672 in words is "sixty-six million, seven hundred twenty-six thousand, six hundred seventy-two".