644002224090 has 32 divisors (see below), whose sum is σ = 1636523300160. Its totient is φ = 161631930624.

The previous prime is 644002224059. The next prime is 644002224097. The reversal of 644002224090 is 90422200446.

It is not an unprimeable number, because it can be changed into a prime (644002224097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 631374220 + ... + 631375239.

It is an arithmetic number, because the mean of its divisors is an integer number (51141353130).

Almost surely, 2^644002224090 is an apocalyptic number.

644002224090 is an abundant number, since it is smaller than the sum of its proper divisors (992521076070).

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

644002224090 is a wasteful number, since it uses less digits than its factorization.

644002224090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262749486.

The product of its (nonzero) digits is 27648, while the sum is 33.

The spelling of 644002224090 in words is "six hundred forty-four billion, two million, two hundred twenty-four thousand, ninety".