649286623 has 16 divisors (see below), whose sum is σ = 686848896. Its totient is φ = 613117440.

The previous prime is 649286609. The next prime is 649286629. The reversal of 649286623 is 326682946.

It is a cyclic number.

It is not a de Polignac number, because 649286623 - 2⁵ = 649286591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649286629) 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 15 ways as a sum of consecutive naturals, for example, 149815 + ... + 154087.

It is an arithmetic number, because the mean of its divisors is an integer number (42928056).

Almost surely, 2^649286623 is an apocalyptic number.

649286623 is a deficient number, since it is larger than the sum of its proper divisors (37562273).

649286623 is a wasteful number, since it uses less digits than its factorization.

649286623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4434.

The product of its digits is 746496, while the sum is 46.

The square root of 649286623 is about 25481.1032531953. The cubic root of 649286623 is about 865.9220893094.

The spelling of 649286623 in words is "six hundred forty-nine million, two hundred eighty-six thousand, six hundred twenty-three".