648648639 has 12 divisors (see below), whose sum is σ = 937443000. Its totient is φ = 432198864.

The previous prime is 648648631. The next prime is 648648661. The reversal of 648648639 is 936846846.

It is not a de Polignac number, because 648648639 - 2³ = 648648631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648648631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 949 + ... + 36030.

It is an arithmetic number, because the mean of its divisors is an integer number (78120250).

Almost surely, 2^648648639 is an apocalyptic number.

648648639 is a deficient number, since it is larger than the sum of its proper divisors (288794361).

648648639 is a wasteful number, since it uses less digits than its factorization.

648648639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38934 (or 38931 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The square root of 648648639 is about 25468.5814092580. The cubic root of 648648639 is about 865.6383802560.

The spelling of 648648639 in words is "six hundred forty-eight million, six hundred forty-eight thousand, six hundred thirty-nine".