649636726 has 8 divisors (see below), whose sum is σ = 995188320. Its totient is φ = 317907288.

The previous prime is 649636703. The next prime is 649636739. The reversal of 649636726 is 627636946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 649636726.

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 3 ways as a sum of consecutive naturals, for example, 3455421 + ... + 3455608.

It is an arithmetic number, because the mean of its divisors is an integer number (124398540).

Almost surely, 2^649636726 is an apocalyptic number.

649636726 is a deficient number, since it is larger than the sum of its proper divisors (345551594).

649636726 is a wasteful number, since it uses less digits than its factorization.

649636726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6911078.

The product of its digits is 1959552, while the sum is 49.

The square root of 649636726 is about 25487.9721829729. The cubic root of 649636726 is about 866.0776998094.

The spelling of 649636726 in words is "six hundred forty-nine million, six hundred thirty-six thousand, seven hundred twenty-six".