66800320 has 56 divisors (see below), whose sum is σ = 160020000. Its totient is φ = 26560512.

The previous prime is 66800297. The next prime is 66800339. The reversal of 66800320 is 2300866.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63156 + ... + 64204.

It is an arithmetic number, because the mean of its divisors is an integer number (2857500).

Almost surely, 2^66800320 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 66800320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80010000).

66800320 is an abundant number, since it is smaller than the sum of its proper divisors (93219680).

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

66800320 is a wasteful number, since it uses less digits than its factorization.

66800320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265 (or 1255 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 66800320 is about 8173.1462730089. The cubic root of 66800320 is about 405.7509210171.

The spelling of 66800320 in words is "sixty-six million, eight hundred thousand, three hundred twenty".