649707673444 has 24 divisors (see below), whose sum is σ = 1170383768568. Its totient is φ = 315438689280.

The previous prime is 649707673441. The next prime is 649707673481. The reversal of 649707673444 is 444376707946.

It can be written as a sum of positive squares in 4 ways, for example, as 253903116544 + 395804556900 = 503888^2 + 629130^2 .

It is a super-2 number, since 2×649707673444² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649707673441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15776647 + ... + 15817774.

It is an arithmetic number, because the mean of its divisors is an integer number (48765990357).

Almost surely, 2^649707673444 is an apocalyptic number.

It is an amenable number.

649707673444 is a deficient number, since it is larger than the sum of its proper divisors (520676095124).

649707673444 is a wasteful number, since it uses less digits than its factorization.

649707673444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31594575 (or 31594573 counting only the distinct ones).

The product of its (nonzero) digits is 85349376, while the sum is 61.

The spelling of 649707673444 in words is "six hundred forty-nine billion, seven hundred seven million, six hundred seventy-three thousand, four hundred forty-four".