643204800 has 420 divisors, whose sum is σ = 2705821360. Its totient is φ = 146810880.

The previous prime is 643204787. The next prime is 643204811. The reversal of 643204800 is 8402346.

It is a tau number, because it is divible by the number of its divisors (420).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 906846 + ... + 907554.

Almost surely, 2^643204800 is an apocalyptic number.

643204800 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 643204800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1352910680).

643204800 is an abundant number, since it is smaller than the sum of its proper divisors (2062616560).

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

643204800 is a wasteful number, since it uses less digits than its factorization.

643204800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 726 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 643204800 is about 25361.4826065039. The cubic root of 643204800 is about 863.2099258949.

The spelling of 643204800 in words is "six hundred forty-three million, two hundred four thousand, eight hundred".