669637144 has 64 divisors (see below), whose sum is σ = 1423850400. Its totient is φ = 292454400.

The previous prime is 669637109. The next prime is 669637181. The reversal of 669637144 is 441736966.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 669637094 and 669637103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 655354 + ... + 656374.

Almost surely, 2^669637144 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 669637144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (711925200).

669637144 is an abundant number, since it is smaller than the sum of its proper divisors (754213256).

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

669637144 is a wasteful number, since it uses less digits than its factorization.

669637144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324 (or 1320 counting only the distinct ones).

The product of its digits is 653184, while the sum is 46.

The square root of 669637144 is about 25877.3480866954. The cubic root of 669637144 is about 874.8760179163.

The spelling of 669637144 in words is "six hundred sixty-nine million, six hundred thirty-seven thousand, one hundred forty-four".