669381648 has 80 divisors (see below), whose sum is σ = 1866338880. Its totient is φ = 205512192.

The previous prime is 669381623. The next prime is 669381701. The reversal of 669381648 is 846183966.

669381648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 669381648.

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, 385390 + ... + 387122.

It is an arithmetic number, because the mean of its divisors is an integer number (23329236).

Almost surely, 2^669381648 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 669381648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (933169440).

669381648 is an abundant number, since it is smaller than the sum of its proper divisors (1196957232).

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

669381648 is a wasteful number, since it uses less digits than its factorization.

669381648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376 (or 2370 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 51.

The square root of 669381648 is about 25872.4109429330. The cubic root of 669381648 is about 874.7647358787.

It can be divided in two parts, 66938 and 1648, that added together give a palindrome (68586).

The spelling of 669381648 in words is "six hundred sixty-nine million, three hundred eighty-one thousand, six hundred forty-eight".