669263868 has 144 divisors (see below), whose sum is σ = 2131024896. Its totient is φ = 172368000.

The previous prime is 669263863. The next prime is 669263893. The reversal of 669263868 is 868362966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669263863) 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, 138493 + ... + 143243.

It is an arithmetic number, because the mean of its divisors is an integer number (14798784).

Almost surely, 2^669263868 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 669263868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1065512448).

669263868 is an abundant number, since it is smaller than the sum of its proper divisors (1461761028).

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

669263868 is a wasteful number, since it uses less digits than its factorization.

669263868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4824 (or 4819 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The square root of 669263868 is about 25870.1346730163. The cubic root of 669263868 is about 874.7134269160.

The spelling of 669263868 in words is "six hundred sixty-nine million, two hundred sixty-three thousand, eight hundred sixty-eight".