669068736 has 252 divisors, whose sum is σ = 2184382728. Its totient is φ = 180182016.

The previous prime is 669068731. The next prime is 669068737. The reversal of 669068736 is 637860966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669068731) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3396190 + ... + 3396386.

Almost surely, 2^669068736 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 669068736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1092191364).

669068736 is an abundant number, since it is smaller than the sum of its proper divisors (1515313992).

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

669068736 is a wasteful number, since it uses less digits than its factorization.

669068736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 51.

The square root of 669068736 is about 25866.3630222728. The cubic root of 669068736 is about 874.6284075489.

The spelling of 669068736 in words is "six hundred sixty-nine million, sixty-eight thousand, seven hundred thirty-six".