646040244 has 12 divisors (see below), whose sum is σ = 1507427264. Its totient is φ = 215346744.

The previous prime is 646040201. The next prime is 646040251. The reversal of 646040244 is 442040646.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26918332 + ... + 26918355.

Almost surely, 2^646040244 is an apocalyptic number.

It is an amenable number.

646040244 is an abundant number, since it is smaller than the sum of its proper divisors (861387020).

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

646040244 is a wasteful number, since it uses less digits than its factorization.

646040244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53836694 (or 53836692 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 646040244 is about 25417.3217314492. The cubic root of 646040244 is about 864.4764979216.

The spelling of 646040244 in words is "six hundred forty-six million, forty thousand, two hundred forty-four".