66785472 has 140 divisors (see below), whose sum is σ = 213416896. Its totient is φ = 20528640.

The previous prime is 66785461. The next prime is 66785473. The reversal of 66785472 is 27458766.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (66785473) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 66897 + ... + 67887.

Almost surely, 2^66785472 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 66785472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106708448).

66785472 is an abundant number, since it is smaller than the sum of its proper divisors (146631424).

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

66785472 is a wasteful number, since it uses less digits than its factorization.

66785472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028 (or 1009 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 66785472 is about 8172.2378820003. The cubic root of 66785472 is about 405.7208561107.

The spelling of 66785472 in words is "sixty-six million, seven hundred eighty-five thousand, four hundred seventy-two".