669822944 has 144 divisors (see below), whose sum is σ = 1603022400. Its totient is φ = 274498560.

The previous prime is 669822893. The next prime is 669822953. The reversal of 669822944 is 449228966.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 669822892 and 669822901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4495382 + ... + 4495530.

It is an arithmetic number, because the mean of its divisors is an integer number (11132100).

Almost surely, 2^669822944 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 669822944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (801511200).

669822944 is an abundant number, since it is smaller than the sum of its proper divisors (933199456).

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

669822944 is a wasteful number, since it uses less digits than its factorization.

669822944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 266 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 50.

The square root of 669822944 is about 25880.9378500857. The cubic root of 669822944 is about 874.9569258796.

The spelling of 669822944 in words is "six hundred sixty-nine million, eight hundred twenty-two thousand, nine hundred forty-four".