643456622 has 8 divisors (see below), whose sum is σ = 1015984200. Its totient is φ = 304795224.

The previous prime is 643456621. The next prime is 643456631. The reversal of 643456622 is 226654346.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 16933069 = 643456622 / (6 + 4 + 3 + 4 + 5 + 6 + 6 + 2 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643456621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8466497 + ... + 8466572.

It is an arithmetic number, because the mean of its divisors is an integer number (126998025).

Almost surely, 2^643456622 is an apocalyptic number.

643456622 is a deficient number, since it is larger than the sum of its proper divisors (372527578).

643456622 is a wasteful number, since it uses less digits than its factorization.

643456622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16933090.

The product of its digits is 207360, while the sum is 38.

The square root of 643456622 is about 25366.4467752186. The cubic root of 643456622 is about 863.3225633668.

The spelling of 643456622 in words is "six hundred forty-three million, four hundred fifty-six thousand, six hundred twenty-two".