666028782 has 24 divisors (see below), whose sum is σ = 1443809640. Its totient is φ = 221894640.

The previous prime is 666028747. The next prime is 666028789. The reversal of 666028782 is 287820666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666028789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30732 + ... + 47712.

It is an arithmetic number, because the mean of its divisors is an integer number (60158735).

Almost surely, 2^666028782 is an apocalyptic number.

666028782 is an abundant number, since it is smaller than the sum of its proper divisors (777780858).

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

666028782 is a wasteful number, since it uses less digits than its factorization.

666028782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19168 (or 19165 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 666028782 is about 25807.5334350263. The cubic root of 666028782 is about 873.3017540330.

The spelling of 666028782 in words is "six hundred sixty-six million, twenty-eight thousand, seven hundred eighty-two".