643540022 has 8 divisors (see below), whose sum is σ = 981671400. Its totient is φ = 316316224.

The previous prime is 643540003. The next prime is 643540031. The reversal of 643540022 is 220045346.

643540022 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 643539973 and 643540000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2726747 + ... + 2726982.

It is an arithmetic number, because the mean of its divisors is an integer number (122708925).

Almost surely, 2^643540022 is an apocalyptic number.

643540022 is a deficient number, since it is larger than the sum of its proper divisors (338131378).

643540022 is a wasteful number, since it uses less digits than its factorization.

643540022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5453790.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 643540022 is about 25368.0906258236. The cubic root of 643540022 is about 863.3598608778.

Adding to 643540022 its reverse (220045346), we get a palindrome (863585368).

The spelling of 643540022 in words is "six hundred forty-three million, five hundred forty thousand, twenty-two".