649145889 has 24 divisors (see below), whose sum is σ = 1108560960. Its totient is φ = 358148448.

The previous prime is 649145879. The next prime is 649145891. The reversal of 649145889 is 988541946.

649145889 is a `hidden beast` number, since 6 + 49 + 14 + 588 + 9 = 666.

It is not a de Polignac number, because 649145889 - 2⁹ = 649145377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (649145839) 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 23 ways as a sum of consecutive naturals, for example, 175827 + ... + 179480.

It is an arithmetic number, because the mean of its divisors is an integer number (46190040).

Almost surely, 2^649145889 is an apocalyptic number.

It is an amenable number.

649145889 is a deficient number, since it is larger than the sum of its proper divisors (459415071).

649145889 is a wasteful number, since it uses less digits than its factorization.

649145889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355349 (or 355346 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The square root of 649145889 is about 25478.3415669074. The cubic root of 649145889 is about 865.8595214178.

The spelling of 649145889 in words is "six hundred forty-nine million, one hundred forty-five thousand, eight hundred eighty-nine".