666880288 has 24 divisors (see below), whose sum is σ = 1358195580. Its totient is φ = 321941760.

The previous prime is 666880273. The next prime is 666880303. The reversal of 666880288 is 882088666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (666880273) and next prime (666880303).

It can be written as a sum of positive squares in 2 ways, for example, as 666259344 + 620944 = 25812^2 + 788^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358383 + ... + 360238.

Almost surely, 2^666880288 is an apocalyptic number.

It is an amenable number.

666880288 is an abundant number, since it is smaller than the sum of its proper divisors (691315292).

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

666880288 is a wasteful number, since it uses less digits than its factorization.

666880288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718660 (or 718652 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 52.

The square root of 666880288 is about 25824.0254027137. The cubic root of 666880288 is about 873.6737624836.

The spelling of 666880288 in words is "six hundred sixty-six million, eight hundred eighty thousand, two hundred eighty-eight".