669888288 has 72 divisors (see below), whose sum is σ = 1907722908. Its totient is φ = 222976512.

The previous prime is 669888287. The next prime is 669888341. The reversal of 669888288 is 882888966.

It can be written as a sum of positive squares in 2 ways, for example, as 660078864 + 9809424 = 25692^2 + 3132^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (669888287) 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 11 ways as a sum of consecutive naturals, for example, 285970 + ... + 288302.

Almost surely, 2^669888288 is an apocalyptic number.

It is an amenable number.

669888288 is an abundant number, since it is smaller than the sum of its proper divisors (1237834620).

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

669888288 is a wasteful number, since it uses less digits than its factorization.

669888288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3346 (or 3335 counting only the distinct ones).

The product of its digits is 21233664, while the sum is 63.

The square root of 669888288 is about 25882.2002155922. The cubic root of 669888288 is about 874.9853768441.

The spelling of 669888288 in words is "six hundred sixty-nine million, eight hundred eighty-eight thousand, two hundred eighty-eight".