669996000 has 288 divisors, whose sum is σ = 2446936128. Its totient is φ = 173491200.

The previous prime is 669995947. The next prime is 669996007. The reversal of 669996000 is 699966.

It is a tau number, because it is divible by the number of its divisors (288).

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 (669996007) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1331749 + ... + 1332251.

It is an arithmetic number, because the mean of its divisors is an integer number (8496306).

Almost surely, 2^669996000 is an apocalyptic number.

669996000 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 669996000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1223468064).

669996000 is an abundant number, since it is smaller than the sum of its proper divisors (1776940128).

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

669996000 is a wasteful number, since it uses less digits than its factorization.

669996000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 669996000 is about 25884.2809442333. The cubic root of 669996000 is about 875.0322709186.

The spelling of 669996000 in words is "six hundred sixty-nine million, nine hundred ninety-six thousand".