669328416 has 72 divisors (see below), whose sum is σ = 1924862940. Its totient is φ = 220594176.

The previous prime is 669328393. The next prime is 669328423. The reversal of 669328416 is 614823966.

It can be written as a sum of positive squares in 2 ways, for example, as 662547600 + 6780816 = 25740^2 + 2604^2 .

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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12576 + ... + 38688.

Almost surely, 2^669328416 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 669328416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (962431470).

669328416 is an abundant number, since it is smaller than the sum of its proper divisors (1255534524).

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

669328416 is a wasteful number, since it uses less digits than its factorization.

669328416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26218 (or 26207 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 669328416 is about 25871.3821818626. The cubic root of 669328416 is about 874.7415469595.

The spelling of 669328416 in words is "six hundred sixty-nine million, three hundred twenty-eight thousand, four hundred sixteen".