644900049012 has 24 divisors (see below), whose sum is σ = 1504809849312. Its totient is φ = 214960530400.

The previous prime is 644900049007. The next prime is 644900049023. The reversal of 644900049012 is 210940009446.

It is a super-2 number, since 2×644900049012² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 321939 + ... + 1180442.

It is an arithmetic number, because the mean of its divisors is an integer number (62700410388).

Almost surely, 2^644900049012 is an apocalyptic number.

It is an amenable number.

644900049012 is an abundant number, since it is smaller than the sum of its proper divisors (859909800300).

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

644900049012 is a wasteful number, since it uses less digits than its factorization.

644900049012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538159 (or 1538157 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The spelling of 644900049012 in words is "six hundred forty-four billion, nine hundred million, forty-nine thousand, twelve".