644063090852 has 24 divisors (see below), whose sum is σ = 1129597472640. Its totient is φ = 321321742560.

The previous prime is 644063090791. The next prime is 644063090857. The reversal of 644063090852 is 258090360446.

644063090852 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 644063090797 and 644063090806.

It is not an unprimeable number, because it can be changed into a prime (644063090857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3207674 + ... + 3402542.

It is an arithmetic number, because the mean of its divisors is an integer number (47066561360).

Almost surely, 2^644063090852 is an apocalyptic number.

It is an amenable number.

644063090852 is a deficient number, since it is larger than the sum of its proper divisors (485534381788).

644063090852 is a wasteful number, since it uses less digits than its factorization.

644063090852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196691 (or 196689 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 644063090852 in words is "six hundred forty-four billion, sixty-three million, ninety thousand, eight hundred fifty-two".