666072880 has 80 divisors (see below), whose sum is σ = 1730701728. Its totient is φ = 236288000.

The previous prime is 666072877. The next prime is 666072887. The reversal of 666072880 is 88270666.

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

It is not an unprimeable number, because it can be changed into a prime (666072887) 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, 26850 + ... + 45310.

Almost surely, 2^666072880 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 666072880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (865350864).

666072880 is an abundant number, since it is smaller than the sum of its proper divisors (1064628848).

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

666072880 is a wasteful number, since it uses less digits than its factorization.

666072880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18526 (or 18520 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 666072880 is about 25808.3877838194. The cubic root of 666072880 is about 873.3210274797.

The spelling of 666072880 in words is "six hundred sixty-six million, seventy-two thousand, eight hundred eighty".