669944730 has 192 divisors, whose sum is σ = 2040698880. Its totient is φ = 137749248.

The previous prime is 669944719. The next prime is 669944753. The reversal of 669944730 is 37449966.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 669944730.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1525851 + ... + 1526289.

It is an arithmetic number, because the mean of its divisors is an integer number (10628640).

Almost surely, 2^669944730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669944730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1020349440).

669944730 is an abundant number, since it is smaller than the sum of its proper divisors (1370754150).

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

669944730 is a wasteful number, since it uses less digits than its factorization.

669944730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 48.

The square root of 669944730 is about 25883.2905558779. The cubic root of 669944730 is about 875.0099503630.

The spelling of 669944730 in words is "six hundred sixty-nine million, nine hundred forty-four thousand, seven hundred thirty".