669319728 has 240 divisors, whose sum is σ = 2207025408. Its totient is φ = 171072000.

The previous prime is 669319727. The next prime is 669319753. The reversal of 669319728 is 827913966.

It is not an unprimeable number, because it can be changed into a prime (669319723) 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, 4106175 + ... + 4106337.

Almost surely, 2^669319728 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 669319728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1103512704).

669319728 is an abundant number, since it is smaller than the sum of its proper divisors (1537705680).

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

669319728 is a wasteful number, since it uses less digits than its factorization.

669319728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 287 counting only the distinct ones).

The product of its digits is 979776, while the sum is 51.

The square root of 669319728 is about 25871.2142737831. The cubic root of 669319728 is about 874.7377621770.

The spelling of 669319728 in words is "six hundred sixty-nine million, three hundred nineteen thousand, seven hundred twenty-eight".