649198772 has 6 divisors (see below), whose sum is σ = 1136097858. Its totient is φ = 324599384.

The previous prime is 649198763. The next prime is 649198777. The reversal of 649198772 is 277891946.

It can be written as a sum of positive squares in only one way, i.e., 413146276 + 236052496 = 20326^2 + 15364^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649198777) 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 as a sum of consecutive naturals, namely, 81149843 + ... + 81149850.

It is an arithmetic number, because the mean of its divisors is an integer number (189349643).

Almost surely, 2^649198772 is an apocalyptic number.

It is an amenable number.

649198772 is a deficient number, since it is larger than the sum of its proper divisors (486899086).

649198772 is a wasteful number, since it uses less digits than its factorization.

649198772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162299697 (or 162299695 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 53.

The square root of 649198772 is about 25479.3793487989. The cubic root of 649198772 is about 865.8830333414.

The spelling of 649198772 in words is "six hundred forty-nine million, one hundred ninety-eight thousand, seven hundred seventy-two".