644513102038 has 96 divisors (see below), whose sum is σ = 1143214017120. Its totient is φ = 270701015040.

The previous prime is 644513102029. The next prime is 644513102041. The reversal of 644513102038 is 830201315446.

It is a junction number, because it is equal to n+sod(n) for n = 644513101988 and 644513102006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27030970 + ... + 27054802.

It is an arithmetic number, because the mean of its divisors is an integer number (11908479345).

Almost surely, 2^644513102038 is an apocalyptic number.

644513102038 is a deficient number, since it is larger than the sum of its proper divisors (498700915082).

644513102038 is a wasteful number, since it uses less digits than its factorization.

644513102038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24002 (or 23985 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 644513102038 in words is "six hundred forty-four billion, five hundred thirteen million, one hundred two thousand, thirty-eight".