649628999 has 4 divisors (see below), whose sum is σ = 660639720. Its totient is φ = 638618280.

The previous prime is 649628983. The next prime is 649629011. The reversal of 649628999 is 999826946.

649628999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 649628999 - 2⁴ = 649628983 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 (649628909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5505272 + ... + 5505389.

It is an arithmetic number, because the mean of its divisors is an integer number (165159930).

Almost surely, 2^649628999 is an apocalyptic number.

649628999 is a deficient number, since it is larger than the sum of its proper divisors (11010721).

649628999 is a wasteful number, since it uses less digits than its factorization.

649628999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11010720.

The product of its digits is 15116544, while the sum is 62.

The square root of 649628999 is about 25487.8206012205. The cubic root of 649628999 is about 866.0742659883.

The spelling of 649628999 in words is "six hundred forty-nine million, six hundred twenty-eight thousand, nine hundred ninety-nine".