643800234 has 64 divisors (see below), whose sum is σ = 1699771392. Its totient is φ = 157382400.

The previous prime is 643800233. The next prime is 643800277. The reversal of 643800234 is 432008346.

It is not an unprimeable number, because it can be changed into a prime (643800233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33132 + ... + 48839.

It is an arithmetic number, because the mean of its divisors is an integer number (26558928).

Almost surely, 2^643800234 is an apocalyptic number.

643800234 is an abundant number, since it is smaller than the sum of its proper divisors (1055971158).

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

643800234 is a wasteful number, since it uses less digits than its factorization.

643800234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82011.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 643800234 is about 25373.2188340384. The cubic root of 643800234 is about 863.4762101934.

The spelling of 643800234 in words is "six hundred forty-three million, eight hundred thousand, two hundred thirty-four".