643876055 has 8 divisors (see below), whose sum is σ = 772952544. Its totient is φ = 514900000.

The previous prime is 643876001. The next prime is 643876061. The reversal of 643876055 is 550678346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643876055 - 2²⁸ = 375440599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643875997 and 643876015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10196 + ... + 37305.

It is an arithmetic number, because the mean of its divisors is an integer number (96619068).

Almost surely, 2^643876055 is an apocalyptic number.

643876055 is a deficient number, since it is larger than the sum of its proper divisors (129076489).

643876055 is a wasteful number, since it uses less digits than its factorization.

643876055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50217.

The product of its (nonzero) digits is 604800, while the sum is 44.

The square root of 643876055 is about 25374.7129047798. The cubic root of 643876055 is about 863.5101063495.

It can be divided in two parts, 643 and 876055, that multiplied together give a palindrome (563303365).

The spelling of 643876055 in words is "six hundred forty-three million, eight hundred seventy-six thousand, fifty-five".