669843928 has 64 divisors (see below), whose sum is σ = 1455844320. Its totient is φ = 286156800.

The previous prime is 669843887. The next prime is 669843959. The reversal of 669843928 is 829348966.

It is a happy number.

669843928 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 15 ways as a sum of consecutive naturals, for example, 104743 + ... + 110953.

Almost surely, 2^669843928 is an apocalyptic number.

669843928 is a gapful number since it is divisible by the number (68) 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 669843928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (727922160).

669843928 is an abundant number, since it is smaller than the sum of its proper divisors (786000392).

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

669843928 is a wasteful number, since it uses less digits than its factorization.

669843928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6308 (or 6304 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 55.

The square root of 669843928 is about 25881.3432418026. The cubic root of 669843928 is about 874.9660625749.

The spelling of 669843928 in words is "six hundred sixty-nine million, eight hundred forty-three thousand, nine hundred twenty-eight".