643481200 has 30 divisors (see below), whose sum is σ = 1545964544. Its totient is φ = 257392320.

The previous prime is 643481159. The next prime is 643481221. The reversal of 643481200 is 2184346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 803952 + ... + 804751.

Almost surely, 2^643481200 is an apocalyptic number.

It is an amenable number.

643481200 is an abundant number, since it is smaller than the sum of its proper divisors (902483344).

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

643481200 is a wasteful number, since it uses less digits than its factorization.

643481200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608721 (or 1608710 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 643481200 is about 25366.9312294570. The cubic root of 643481200 is about 863.3335552872. Note that the first 3 decimals are identical.

The spelling of 643481200 in words is "six hundred forty-three million, four hundred eighty-one thousand, two hundred".