649604227 has 4 divisors (see below), whose sum is σ = 667161136. Its totient is φ = 632047320.

The previous prime is 649604213. The next prime is 649604237. The reversal of 649604227 is 722406946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 722406946 = 2 ⋅361203473.

It is not a de Polignac number, because 649604227 - 2⁷ = 649604099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 649604227.

It is not an unprimeable number, because it can be changed into a prime (649604237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8778399 + ... + 8778472.

It is an arithmetic number, because the mean of its divisors is an integer number (166790284).

Almost surely, 2^649604227 is an apocalyptic number.

649604227 is a deficient number, since it is larger than the sum of its proper divisors (17556909).

649604227 is a wasteful number, since it uses less digits than its factorization.

649604227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17556908.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 649604227 is about 25487.3346389928. The cubic root of 649604227 is about 866.0632573128.

The spelling of 649604227 in words is "six hundred forty-nine million, six hundred four thousand, two hundred twenty-seven".