669006520 has 256 divisors, whose sum is σ = 1979873280. Its totient is φ = 197683200.

The previous prime is 669006463. The next prime is 669006521. The reversal of 669006520 is 25600966.

669006520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669006521) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5106855 + ... + 5106985.

It is an arithmetic number, because the mean of its divisors is an integer number (7733880).

Almost surely, 2^669006520 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 669006520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (989936640).

669006520 is an abundant number, since it is smaller than the sum of its proper divisors (1310866760).

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

669006520 is a wasteful number, since it uses less digits than its factorization.

669006520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 669006520 is about 25865.1603513297. The cubic root of 669006520 is about 874.6012964491.

The spelling of 669006520 in words is "six hundred sixty-nine million, six thousand, five hundred twenty".