666828708 has 144 divisors (see below), whose sum is σ = 1947939840. Its totient is φ = 173826432.

The previous prime is 666828691. The next prime is 666828709. The reversal of 666828708 is 807828666.

It is not an unprimeable number, because it can be changed into a prime (666828709) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1518753 + ... + 1519191.

It is an arithmetic number, because the mean of its divisors is an integer number (13527360).

Almost surely, 2^666828708 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 666828708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (973969920).

666828708 is an abundant number, since it is smaller than the sum of its proper divisors (1281111132).

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

666828708 is a wasteful number, since it uses less digits than its factorization.

666828708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586 (or 571 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The square root of 666828708 is about 25823.0267009892. The cubic root of 666828708 is about 873.6512370742.

The spelling of 666828708 in words is "six hundred sixty-six million, eight hundred twenty-eight thousand, seven hundred eight".