643036798 has 32 divisors (see below), whose sum is σ = 1097971200. Its totient is φ = 280566144.

The previous prime is 643036787. The next prime is 643036799. The reversal of 643036798 is 897630346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643036799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19773 + ... + 40951.

It is an arithmetic number, because the mean of its divisors is an integer number (34311600).

Almost surely, 2^643036798 is an apocalyptic number.

643036798 is a deficient number, since it is larger than the sum of its proper divisors (454934402).

643036798 is a wasteful number, since it uses less digits than its factorization.

643036798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21264.

The product of its (nonzero) digits is 653184, while the sum is 46.

The square root of 643036798 is about 25358.1702415612. The cubic root of 643036798 is about 863.1347639236.

The spelling of 643036798 in words is "six hundred forty-three million, thirty-six thousand, seven hundred ninety-eight".