666204280 has 64 divisors (see below), whose sum is σ = 1715682240. Its totient is φ = 228068352.

The previous prime is 666204257. The next prime is 666204283. The reversal of 666204280 is 82402666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666204283) 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, 244204 + ... + 246916.

It is an arithmetic number, because the mean of its divisors is an integer number (26807535).

Almost surely, 2^666204280 is an apocalyptic number.

It is an amenable number.

666204280 is an abundant number, since it is smaller than the sum of its proper divisors (1049477960).

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

666204280 is a wasteful number, since it uses less digits than its factorization.

666204280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3608 (or 3604 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 666204280 is about 25810.9333422873. The cubic root of 666204280 is about 873.3784520455.

The spelling of 666204280 in words is "six hundred sixty-six million, two hundred four thousand, two hundred eighty".