643214900 has 18 divisors (see below), whose sum is σ = 1395776550. Its totient is φ = 257285920.

The previous prime is 643214893. The next prime is 643214903. The reversal of 643214900 is 9412346.

643214900 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 1909924 + 641304976 = 1382^2 + 25324^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643214903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3215975 + ... + 3216174.

Almost surely, 2^643214900 is an apocalyptic number.

It is an amenable number.

643214900 is an abundant number, since it is smaller than the sum of its proper divisors (752561650).

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

643214900 is a wasteful number, since it uses less digits than its factorization.

643214900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6432163 (or 6432156 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 643214900 is about 25361.6817265733. The cubic root of 643214900 is about 863.2144440901.

The spelling of 643214900 in words is "six hundred forty-three million, two hundred fourteen thousand, nine hundred".