66774132 has 60 divisors (see below), whose sum is σ = 183765120. Its totient is φ = 21084624.

The previous prime is 66774109. The next prime is 66774157. The reversal of 66774132 is 23147766.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 733 + ... + 11579.

It is an arithmetic number, because the mean of its divisors is an integer number (3062752).

Almost surely, 2^66774132 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 66774132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91882560).

66774132 is an abundant number, since it is smaller than the sum of its proper divisors (116990988).

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

66774132 is a wasteful number, since it uses less digits than its factorization.

66774132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10882 (or 10871 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 66774132 is about 8171.5440401432. The cubic root of 66774132 is about 405.6978913610.

The spelling of 66774132 in words is "sixty-six million, seven hundred seventy-four thousand, one hundred thirty-two".