643358841 has 16 divisors (see below), whose sum is σ = 889958400. Its totient is φ = 412972560.

The previous prime is 643358831. The next prime is 643358843. The reversal of 643358841 is 148853346.

It is not a de Polignac number, because 643358841 - 2⁶ = 643358777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643358793 and 643358802.

It is not an unprimeable number, because it can be changed into a prime (643358843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1126 + ... + 35888.

It is an arithmetic number, because the mean of its divisors is an integer number (55622400).

Almost surely, 2^643358841 is an apocalyptic number.

It is an amenable number.

643358841 is a deficient number, since it is larger than the sum of its proper divisors (246599559).

643358841 is a wasteful number, since it uses less digits than its factorization.

643358841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34996.

The product of its digits is 276480, while the sum is 42.

The square root of 643358841 is about 25364.5193331157. The cubic root of 643358841 is about 863.2788303903.

The spelling of 643358841 in words is "six hundred forty-three million, three hundred fifty-eight thousand, eight hundred forty-one".