66317280 has 96 divisors (see below), whose sum is σ = 218018304. Its totient is φ = 16912896.

The previous prime is 66317263. The next prime is 66317281. The reversal of 66317280 is 8271366.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66317281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8037 + ... + 14043.

It is an arithmetic number, because the mean of its divisors is an integer number (2271024).

Almost surely, 2^66317280 is an apocalyptic number.

66317280 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 66317280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109009152).

66317280 is an abundant number, since it is smaller than the sum of its proper divisors (151701024).

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

66317280 is a wasteful number, since it uses less digits than its factorization.

66317280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6048 (or 6040 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 66317280 is about 8143.5422268200. The cubic root of 66317280 is about 404.7705452278.

The spelling of 66317280 in words is "sixty-six million, three hundred seventeen thousand, two hundred eighty".