669290020 has 72 divisors (see below), whose sum is σ = 1658180160. Its totient is φ = 226215360.

The previous prime is 669289963. The next prime is 669290021. The reversal of 669290020 is 20092966.

It is not an unprimeable number, because it can be changed into a prime (669290021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64771 + ... + 74389.

It is an arithmetic number, because the mean of its divisors is an integer number (23030280).

Almost surely, 2^669290020 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 669290020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829090080).

669290020 is an abundant number, since it is smaller than the sum of its proper divisors (988890140).

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

669290020 is a wasteful number, since it uses less digits than its factorization.

669290020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9713 (or 9704 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 669290020 is about 25870.6401157760. The cubic root of 669290020 is about 874.7248201341.

The spelling of 669290020 in words is "six hundred sixty-nine million, two hundred ninety thousand, twenty".