643371798 has 16 divisors (see below), whose sum is σ = 1290332160. Its totient is φ = 213859176.

The previous prime is 643371769. The next prime is 643371853. The reversal of 643371798 is 897173346.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147190 + ... + 151497.

It is an arithmetic number, because the mean of its divisors is an integer number (80645760).

Almost surely, 2^643371798 is an apocalyptic number.

643371798 is an abundant number, since it is smaller than the sum of its proper divisors (646960362).

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

643371798 is a wasteful number, since it uses less digits than its factorization.

643371798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299051.

The product of its digits is 762048, while the sum is 48.

The square root of 643371798 is about 25364.7747476693. The cubic root of 643371798 is about 863.2846257195.

The spelling of 643371798 in words is "six hundred forty-three million, three hundred seventy-one thousand, seven hundred ninety-eight".