66785684 has 48 divisors (see below), whose sum is σ = 143646720. Its totient is φ = 26529120.

The previous prime is 66785683. The next prime is 66785711. The reversal of 66785684 is 48658766.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66785683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23669 + ... + 26339.

It is an arithmetic number, because the mean of its divisors is an integer number (2992640).

Almost surely, 2^66785684 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 66785684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71823360).

66785684 is an abundant number, since it is smaller than the sum of its proper divisors (76861036).

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

66785684 is a wasteful number, since it uses less digits than its factorization.

66785684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2748 (or 2746 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 50.

The square root of 66785684 is about 8172.2508527333. The cubic root of 66785684 is about 405.7212854093.

The spelling of 66785684 in words is "sixty-six million, seven hundred eighty-five thousand, six hundred eighty-four".