643200385 has 16 divisors (see below), whose sum is σ = 777208320. Its totient is φ = 510995520.

The previous prime is 643200379. The next prime is 643200401. The reversal of 643200385 is 583002346.

It is not a de Polignac number, because 643200385 - 2¹⁷ = 643069313 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 753619 + ... + 754471.

It is an arithmetic number, because the mean of its divisors is an integer number (48575520).

Almost surely, 2^643200385 is an apocalyptic number.

It is an amenable number.

643200385 is a deficient number, since it is larger than the sum of its proper divisors (134007935).

643200385 is a wasteful number, since it uses less digits than its factorization.

643200385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 643200385 is about 25361.3955649132. The cubic root of 643200385 is about 863.2079508472.

The spelling of 643200385 in words is "six hundred forty-three million, two hundred thousand, three hundred eighty-five".