643441212 has 48 divisors (see below), whose sum is σ = 1725712800. Its totient is φ = 207083520.

The previous prime is 643441181. The next prime is 643441243. The reversal of 643441212 is 212144346.

It is a happy number.

643441212 is a `hidden beast` number, since 6 + 4 + 3 + 441 + 212 = 666.

It is an interprime number because it is at equal distance from previous prime (643441181) and next prime (643441243).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99589 + ... + 105852.

It is an arithmetic number, because the mean of its divisors is an integer number (35952350).

Almost surely, 2^643441212 is an apocalyptic number.

It is an amenable number.

643441212 is an abundant number, since it is smaller than the sum of its proper divisors (1082271588).

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

643441212 is a wasteful number, since it uses less digits than its factorization.

643441212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205483 (or 205475 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 643441212 is about 25366.1430256947. The cubic root of 643441212 is about 863.3156714716.

Adding to 643441212 its reverse (212144346), we get a palindrome (855585558).

It can be divided in two parts, 64344 and 1212, that added together give a palindrome (65556).

The spelling of 643441212 in words is "six hundred forty-three million, four hundred forty-one thousand, two hundred twelve".