66240180 has 120 divisors (see below), whose sum is σ = 214663680. Its totient is φ = 17081280.

The previous prime is 66240173. The next prime is 66240191. The reversal of 66240180 is 8104266.

It is a super-2 number, since 2×66240180² = 8775522892864800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 49561 + ... + 50879.

It is an arithmetic number, because the mean of its divisors is an integer number (1788864).

Almost surely, 2^66240180 is an apocalyptic number.

66240180 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 66240180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107331840).

66240180 is an abundant number, since it is smaller than the sum of its proper divisors (148423500).

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

66240180 is a wasteful number, since it uses less digits than its factorization.

66240180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371 (or 1360 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 66240180 is about 8138.8070378895. The cubic root of 66240180 is about 404.6136232770.

The spelling of 66240180 in words is "sixty-six million, two hundred forty thousand, one hundred eighty".