669919680 has 224 divisors, whose sum is σ = 2502895680. Its totient is φ = 168099840.

The previous prime is 669919673. The next prime is 669919699. The reversal of 669919680 is 86919966.

669919680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144600 + ... + 149160.

Almost surely, 2^669919680 is an apocalyptic number.

669919680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669919680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1251447840).

669919680 is an abundant number, since it is smaller than the sum of its proper divisors (1832976000).

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

669919680 is a wasteful number, since it uses less digits than its factorization.

669919680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4604 (or 4588 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 669919680 is about 25882.8066484298. The cubic root of 669919680 is about 874.9990443527. Note that the first 3 decimals are identical.

The spelling of 669919680 in words is "six hundred sixty-nine million, nine hundred nineteen thousand, six hundred eighty".