666780240 has 360 divisors, whose sum is σ = 2526668640. Its totient is φ = 144990720.

The previous prime is 666780229. The next prime is 666780269. The reversal of 666780240 is 42087666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 11301331 + ... + 11301389.

It is an arithmetic number, because the mean of its divisors is an integer number (7018524).

Almost surely, 2^666780240 is an apocalyptic number.

666780240 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 666780240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1263334320).

666780240 is an abundant number, since it is smaller than the sum of its proper divisors (1859888400).

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

666780240 is a wasteful number, since it uses less digits than its factorization.

666780240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 666780240 is about 25822.0882191971. The cubic root of 666780240 is about 873.6300696422.

The spelling of 666780240 in words is "six hundred sixty-six million, seven hundred eighty thousand, two hundred forty".