643466220 has 24 divisors (see below), whose sum is σ = 1801705584. Its totient is φ = 171590976.

The previous prime is 643466209. The next prime is 643466267. The reversal of 643466220 is 22664346.

643466220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 5362159 + ... + 5362278.

It is an arithmetic number, because the mean of its divisors is an integer number (75071066).

Almost surely, 2^643466220 is an apocalyptic number.

643466220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643466220 is an abundant number, since it is smaller than the sum of its proper divisors (1158239364).

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

643466220 is a wasteful number, since it uses less digits than its factorization.

643466220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10724449 (or 10724447 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 33.

The square root of 643466220 is about 25366.6359614356. The cubic root of 643466220 is about 863.3268558752.

The spelling of 643466220 in words is "six hundred forty-three million, four hundred sixty-six thousand, two hundred twenty".