66003280 has 80 divisors (see below), whose sum is σ = 179524224. Its totient is φ = 22095360.

The previous prime is 66003277. The next prime is 66003293. The reversal of 66003280 is 8230066.

66003280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22710 + ... + 25450.

Almost surely, 2^66003280 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 66003280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89762112).

66003280 is an abundant number, since it is smaller than the sum of its proper divisors (113520944).

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

66003280 is a wasteful number, since it uses less digits than its factorization.

66003280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2804 (or 2798 counting only the distinct ones).

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

The square root of 66003280 is about 8124.2402721731. The cubic root of 66003280 is about 404.1306965308.

The spelling of 66003280 in words is "sixty-six million, three thousand, two hundred eighty".