669366720 has 224 divisors, whose sum is σ = 2576413440. Its totient is φ = 162247680.

The previous prime is 669366707. The next prime is 669366727. The reversal of 669366720 is 27663966.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669366727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91519 + ... + 98561.

Almost surely, 2^669366720 is an apocalyptic number.

669366720 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 669366720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1288206720).

669366720 is an abundant number, since it is smaller than the sum of its proper divisors (1907046720).

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

669366720 is a wasteful number, since it uses less digits than its factorization.

669366720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7080 (or 7064 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The square root of 669366720 is about 25872.1224486898. The cubic root of 669366720 is about 874.7582330687.

The spelling of 669366720 in words is "six hundred sixty-nine million, three hundred sixty-six thousand, seven hundred twenty".