669450600 has 576 divisors, whose sum is σ = 2854400640. Its totient is φ = 136857600.

The previous prime is 669450547. The next prime is 669450601. The reversal of 669450600 is 6054966.

It is a happy number.

669450600 is a `hidden beast` number, since 6 + 6 + 9 + 45 + 0 + 600 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669450601) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 9991767 + ... + 9991833.

Almost surely, 2^669450600 is an apocalyptic number.

669450600 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 669450600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1427200320).

669450600 is an abundant number, since it is smaller than the sum of its proper divisors (2184950040).

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

669450600 is a wasteful number, since it uses less digits than its factorization.

669450600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 669450600 is about 25873.7434477503. The cubic root of 669450600 is about 874.7947709154.

The spelling of 669450600 in words is "six hundred sixty-nine million, four hundred fifty thousand, six hundred".