666889248 has 48 divisors (see below), whose sum is σ = 1783627776. Its totient is φ = 218100480.

The previous prime is 666889247. The next prime is 666889261. The reversal of 666889248 is 842988666.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (666889247) 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 7 ways as a sum of consecutive naturals, for example, 60448 + ... + 70623.

It is an arithmetic number, because the mean of its divisors is an integer number (37158912).

Almost surely, 2^666889248 is an apocalyptic number.

It is an amenable number.

666889248 is an abundant number, since it is smaller than the sum of its proper divisors (1116738528).

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

666889248 is a wasteful number, since it uses less digits than its factorization.

666889248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131137 (or 131129 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 57.

The square root of 666889248 is about 25824.1988839925. The cubic root of 666889248 is about 873.6776752708.

The spelling of 666889248 in words is "six hundred sixty-six million, eight hundred eighty-nine thousand, two hundred forty-eight".