643784542 has 8 divisors (see below), whose sum is σ = 989230032. Its totient is φ = 314041200.

The previous prime is 643784527. The next prime is 643784567. The reversal of 643784542 is 245487346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3925434 + ... + 3925597.

It is an arithmetic number, because the mean of its divisors is an integer number (123653754).

Almost surely, 2^643784542 is an apocalyptic number.

643784542 is a deficient number, since it is larger than the sum of its proper divisors (345445490).

643784542 is a wasteful number, since it uses less digits than its factorization.

643784542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7851074.

The product of its digits is 645120, while the sum is 43.

The square root of 643784542 is about 25372.9096084781. The cubic root of 643784542 is about 863.4691946742.

The spelling of 643784542 in words is "six hundred forty-three million, seven hundred eighty-four thousand, five hundred forty-two".