666290880 has 224 divisors, whose sum is σ = 2387681280. Its totient is φ = 174873600.

The previous prime is 666290851. The next prime is 666290881. The reversal of 666290880 is 88092666.

666290880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666290881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 578305 + ... + 579455.

Almost surely, 2^666290880 is an apocalyptic number.

666290880 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 666290880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1193840640).

666290880 is an abundant number, since it is smaller than the sum of its proper divisors (1721390400).

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

666290880 is a wasteful number, since it uses less digits than its factorization.

666290880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244 (or 1228 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 666290880 is about 25812.6108714326. The cubic root of 666290880 is about 873.4162939404.

The spelling of 666290880 in words is "six hundred sixty-six million, two hundred ninety thousand, eight hundred eighty".