669604320 has 720 divisors, whose sum is σ = 3017244384. Its totient is φ = 136857600.

The previous prime is 669604291. The next prime is 669604349. The reversal of 669604320 is 23406966.

It is an interprime number because it is at equal distance from previous prime (669604291) and next prime (669604349).

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 10977090 + ... + 10977150.

Almost surely, 2^669604320 is an apocalyptic number.

669604320 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 669604320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1508622192).

669604320 is an abundant number, since it is smaller than the sum of its proper divisors (2347640064).

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

669604320 is a wasteful number, since it uses less digits than its factorization.

669604320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 669604320 is about 25876.7138562840. The cubic root of 669604320 is about 874.8617229110.

The spelling of 669604320 in words is "six hundred sixty-nine million, six hundred four thousand, three hundred twenty".