643463534 has 16 divisors (see below), whose sum is σ = 1111769088. Its totient is φ = 273597912.

The previous prime is 643463533. The next prime is 643463539. The reversal of 643463534 is 435364346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643463533) 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 7 ways as a sum of consecutive naturals, for example, 179174 + ... + 182729.

It is an arithmetic number, because the mean of its divisors is an integer number (69485568).

Almost surely, 2^643463534 is an apocalyptic number.

643463534 is a deficient number, since it is larger than the sum of its proper divisors (468305554).

643463534 is a wasteful number, since it uses less digits than its factorization.

643463534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362039.

The product of its digits is 311040, while the sum is 38.

The square root of 643463534 is about 25366.5830178209. The cubic root of 643463534 is about 863.3256546211.

The spelling of 643463534 in words is "six hundred forty-three million, four hundred sixty-three thousand, five hundred thirty-four".