643401598 has 32 divisors (see below), whose sum is σ = 1201075200. Its totient is φ = 252219744.

The previous prime is 643401527. The next prime is 643401611. The reversal of 643401598 is 895104346.

It is a self number, because there is not a number n which added to its sum of digits gives 643401598.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 33990 + ... + 49417.

It is an arithmetic number, because the mean of its divisors is an integer number (37533600).

Almost surely, 2^643401598 is an apocalyptic number.

643401598 is a deficient number, since it is larger than the sum of its proper divisors (557673602).

643401598 is a wasteful number, since it uses less digits than its factorization.

643401598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83464.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 643401598 is about 25365.3621696991. The cubic root of 643401598 is about 863.2979541892.

The spelling of 643401598 in words is "six hundred forty-three million, four hundred one thousand, five hundred ninety-eight".