66339780 has 96 divisors (see below), whose sum is σ = 211849344. Its totient is φ = 15366144.

The previous prime is 66339769. The next prime is 66339817. The reversal of 66339780 is 8793366.

66339780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 31 ways as a sum of consecutive naturals, for example, 10759 + ... + 15761.

It is an arithmetic number, because the mean of its divisors is an integer number (2206764).

Almost surely, 2^66339780 is an apocalyptic number.

66339780 is a gapful number since it is divisible by the number (60) 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 66339780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105924672).

66339780 is an abundant number, since it is smaller than the sum of its proper divisors (145509564).

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

66339780 is a wasteful number, since it uses less digits than its factorization.

66339780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5045 (or 5043 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 66339780 is about 8144.9235723854. The cubic root of 66339780 is about 404.8163166440.

The spelling of 66339780 in words is "sixty-six million, three hundred thirty-nine thousand, seven hundred eighty".