669879672 has 256 divisors, whose sum is σ = 2187924480. Its totient is φ = 165888000.

The previous prime is 669879659. The next prime is 669879677. The reversal of 669879672 is 276978966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669879677) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6632422 + ... + 6632522.

It is an arithmetic number, because the mean of its divisors is an integer number (8546580).

Almost surely, 2^669879672 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 669879672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1093962240).

669879672 is an abundant number, since it is smaller than the sum of its proper divisors (1518044808).

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

669879672 is a wasteful number, since it uses less digits than its factorization.

669879672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 258 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 60.

The square root of 669879672 is about 25882.0337686203. The cubic root of 669879672 is about 874.9816255189.

The spelling of 669879672 in words is "six hundred sixty-nine million, eight hundred seventy-nine thousand, six hundred seventy-two".