66339888 has 80 divisors (see below), whose sum is σ = 177176160. Its totient is φ = 21379072.

The previous prime is 66339883. The next prime is 66339901. The reversal of 66339888 is 88893366.

It is a self number, because there is not a number n which added to its sum of digits gives 66339888.

It is not an unprimeable number, because it can be changed into a prime (66339881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226270 + ... + 226562.

It is an arithmetic number, because the mean of its divisors is an integer number (2214702).

Almost surely, 2^66339888 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 66339888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88588080).

66339888 is an abundant number, since it is smaller than the sum of its proper divisors (110836272).

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

66339888 is a wasteful number, since it uses less digits than its factorization.

66339888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 440 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 51.

The square root of 66339888 is about 8144.9302022792. The cubic root of 66339888 is about 404.8165363219.

The spelling of 66339888 in words is "sixty-six million, three hundred thirty-nine thousand, eight hundred eighty-eight".