66715752 has 64 divisors (see below), whose sum is σ = 178459200. Its totient is φ = 20710400.

The previous prime is 66715729. The next prime is 66715757. The reversal of 66715752 is 25751766.

It is a self number, because there is not a number n which added to its sum of digits gives 66715752.

It is not an unprimeable number, because it can be changed into a prime (66715757) 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 15 ways as a sum of consecutive naturals, for example, 40399 + ... + 42017.

It is an arithmetic number, because the mean of its divisors is an integer number (2788425).

Almost surely, 2^66715752 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 66715752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89229600).

66715752 is an abundant number, since it is smaller than the sum of its proper divisors (111743448).

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

66715752 is a wasteful number, since it uses less digits than its factorization.

66715752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746 (or 1742 counting only the distinct ones).

The product of its digits is 88200, while the sum is 39.

The square root of 66715752 is about 8167.9711067070. The cubic root of 66715752 is about 405.5796242619.

The spelling of 66715752 in words is "sixty-six million, seven hundred fifteen thousand, seven hundred fifty-two".