643116344 has 32 divisors (see below), whose sum is σ = 1311229920. Its totient is φ = 293936256.

The previous prime is 643116329. The next prime is 643116347. The reversal of 643116344 is 443611346.

It is a self number, because there is not a number n which added to its sum of digits gives 643116344.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643116347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19307 + ... + 40730.

It is an arithmetic number, because the mean of its divisors is an integer number (40975935).

Almost surely, 2^643116344 is an apocalyptic number.

It is an amenable number.

643116344 is an abundant number, since it is smaller than the sum of its proper divisors (668113576).

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

643116344 is a wasteful number, since it uses less digits than its factorization.

643116344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60159 (or 60155 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

The square root of 643116344 is about 25359.7386421864. The cubic root of 643116344 is about 863.1703534302.

The spelling of 643116344 in words is "six hundred forty-three million, one hundred sixteen thousand, three hundred forty-four".