643473000 has 384 divisors, whose sum is σ = 2365459200. Its totient is φ = 157248000.

The previous prime is 643472989. The next prime is 643473023. The reversal of 643473000 is 374346.

643473000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9062965 + ... + 9063035.

It is an arithmetic number, because the mean of its divisors is an integer number (6160050).

Almost surely, 2^643473000 is an apocalyptic number.

643473000 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 643473000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1182729600).

643473000 is an abundant number, since it is smaller than the sum of its proper divisors (1721986200).

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

643473000 is a wasteful number, since it uses less digits than its factorization.

643473000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 27.

The square root of 643473000 is about 25366.7696011928. The cubic root of 643473000 is about 863.3298880652.

The spelling of 643473000 in words is "six hundred forty-three million, four hundred seventy-three thousand".