669689280 has 336 divisors, whose sum is σ = 2565099264. Its totient is φ = 159252480.

The previous prime is 669689263. The next prime is 669689303. The reversal of 669689280 is 82986966.

669689280 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 an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1160352 + ... + 1160928.

It is an arithmetic number, because the mean of its divisors is an integer number (7634224).

Almost surely, 2^669689280 is an apocalyptic number.

669689280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669689280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1282549632).

669689280 is an abundant number, since it is smaller than the sum of its proper divisors (1895409984).

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

669689280 is a wasteful number, since it uses less digits than its factorization.

669689280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The square root of 669689280 is about 25878.3554346098. The cubic root of 669689280 is about 874.8987224277.

The spelling of 669689280 in words is "six hundred sixty-nine million, six hundred eighty-nine thousand, two hundred eighty".