643428858 has 16 divisors (see below), whose sum is σ = 1331232480. Its totient is φ = 207080496.

The previous prime is 643428827. The next prime is 643428871. The reversal of 643428858 is 858824346.

643428858 is nontrivially palindromic in base 7.

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, 1848760 + ... + 1849107.

It is an arithmetic number, because the mean of its divisors is an integer number (83202030).

Almost surely, 2^643428858 is an apocalyptic number.

643428858 is an abundant number, since it is smaller than the sum of its proper divisors (687803622).

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

643428858 is a wasteful number, since it uses less digits than its factorization.

643428858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3697901.

The product of its digits is 1474560, while the sum is 48.

The square root of 643428858 is about 25365.8995109576. The cubic root of 643428858 is about 863.3101462478.

It can be divided in two parts, 6434288 and 58, that added together give a palindrome (6434346).

The spelling of 643428858 in words is "six hundred forty-three million, four hundred twenty-eight thousand, eight hundred fifty-eight".