643466226 has 16 divisors (see below), whose sum is σ = 1385927424. Its totient is φ = 197989584.

The previous prime is 643466209. The next prime is 643466267. The reversal of 643466226 is 622664346.

It is a happy number.

643466226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 4124706 + ... + 4124861.

It is an arithmetic number, because the mean of its divisors is an integer number (86620464).

Almost surely, 2^643466226 is an apocalyptic number.

643466226 is an abundant number, since it is smaller than the sum of its proper divisors (742461198).

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

643466226 is a wasteful number, since it uses less digits than its factorization.

643466226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8249585.

The product of its digits is 248832, while the sum is 39.

The square root of 643466226 is about 25366.6360797012. The cubic root of 643466226 is about 863.3268585585.

The spelling of 643466226 in words is "six hundred forty-three million, four hundred sixty-six thousand, two hundred twenty-six".