66740832 has 144 divisors (see below), whose sum is σ = 201080880. Its totient is φ = 20966400.

The previous prime is 66740831. The next prime is 66740837. The reversal of 66740832 is 23804766.

66740832 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66740831) 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 23 ways as a sum of consecutive naturals, for example, 509407 + ... + 509537.

It is an arithmetic number, because the mean of its divisors is an integer number (1396395).

Almost surely, 2^66740832 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 66740832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100540440).

66740832 is an abundant number, since it is smaller than the sum of its proper divisors (134340048).

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

66740832 is a wasteful number, since it uses less digits than its factorization.

66740832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 66740832 is about 8169.5062274289. The cubic root of 66740832 is about 405.6304401602.

The spelling of 66740832 in words is "sixty-six million, seven hundred forty thousand, eight hundred thirty-two".