669735984 has 80 divisors (see below), whose sum is σ = 1806071904. Its totient is φ = 213657600.

The previous prime is 669735977. The next prime is 669735991. The reversal of 669735984 is 489537966.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (669735977) and next prime (669735991).

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, 101094 + ... + 107514.

Almost surely, 2^669735984 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 669735984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903035952).

669735984 is an abundant number, since it is smaller than the sum of its proper divisors (1136335920).

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

669735984 is a wasteful number, since it uses less digits than its factorization.

669735984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6526 (or 6520 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 57.

The square root of 669735984 is about 25879.2577946123. The cubic root of 669735984 is about 874.9190603771.

The spelling of 669735984 in words is "six hundred sixty-nine million, seven hundred thirty-five thousand, nine hundred eighty-four".