649710923 has 6 divisors (see below), whose sum is σ = 679187964. Its totient is φ = 621462116.

The previous prime is 649710899. The next prime is 649710937. The reversal of 649710923 is 329017946.

It is not a de Polignac number, because 649710923 - 2⁸ = 649710667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649710023) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 613565 + ... + 614622.

It is an arithmetic number, because the mean of its divisors is an integer number (113197994).

Almost surely, 2^649710923 is an apocalyptic number.

649710923 is a deficient number, since it is larger than the sum of its proper divisors (29477041).

649710923 is a wasteful number, since it uses less digits than its factorization.

649710923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228233 (or 1228210 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 649710923 is about 25489.4276710953. The cubic root of 649710923 is about 866.1106710163.

The spelling of 649710923 in words is "six hundred forty-nine million, seven hundred ten thousand, nine hundred twenty-three".