669447600 has 120 divisors (see below), whose sum is σ = 2218526160. Its totient is φ = 172354560.

The previous prime is 669447599. The next prime is 669447601. The reversal of 669447600 is 6744966.

It is an interprime number because it is at equal distance from previous prime (669447599) and next prime (669447601).

It is a tau number, because it is divible by the number of its divisors (120).

It is not an unprimeable number, because it can be changed into a prime (669447601) 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, 25182 + ... + 44418.

It is an arithmetic number, because the mean of its divisors is an integer number (18487718).

Almost surely, 2^669447600 is an apocalyptic number.

669447600 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 669447600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1109263080).

669447600 is an abundant number, since it is smaller than the sum of its proper divisors (1549078560).

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

669447600 is a wasteful number, since it uses less digits than its factorization.

669447600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19287 (or 19276 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 669447600 is about 25873.6854738555. The cubic root of 669447600 is about 874.7934641781.

The spelling of 669447600 in words is "six hundred sixty-nine million, four hundred forty-seven thousand, six hundred".