66328704 has 192 divisors, whose sum is σ = 212372160. Its totient is φ = 19740672.

The previous prime is 66328681. The next prime is 66328709. The reversal of 66328704 is 40782366.

It is a tau number, because it is divible by the number of its divisors (192).

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

It is not an unprimeable number, because it can be changed into a prime (66328709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 643917 + ... + 644019.

It is an arithmetic number, because the mean of its divisors is an integer number (1106105).

Almost surely, 2^66328704 is an apocalyptic number.

66328704 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66328704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106186080).

66328704 is an abundant number, since it is smaller than the sum of its proper divisors (146043456).

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

66328704 is a wasteful number, since it uses less digits than its factorization.

66328704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 164 counting only the distinct ones).

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

The square root of 66328704 is about 8144.2436112877. The cubic root of 66328704 is about 404.7937861951.

The spelling of 66328704 in words is "sixty-six million, three hundred twenty-eight thousand, seven hundred four".