643413205 has 8 divisors (see below), whose sum is σ = 790927704. Its totient is φ = 502176000.

The previous prime is 643413193. The next prime is 643413217. The reversal of 643413205 is 502314346.

643413205 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (643413193) and next prime (643413217).

It can be written as a sum of positive squares in 4 ways, for example, as 53846244 + 589566961 = 7338^2 + 24281^2 .

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

It is not a de Polignac number, because 643413205 - 2²⁵ = 609858773 is a prime.

It is a Duffinian number.

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, 1569096 + ... + 1569505.

It is an arithmetic number, because the mean of its divisors is an integer number (98865963).

Almost surely, 2^643413205 is an apocalyptic number.

It is an amenable number.

643413205 is a deficient number, since it is larger than the sum of its proper divisors (147514499).

643413205 is a wasteful number, since it uses less digits than its factorization.

643413205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138647.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 643413205 is about 25365.5909649273. The cubic root of 643413205 is about 863.3031454721.

The spelling of 643413205 in words is "six hundred forty-three million, four hundred thirteen thousand, two hundred five".