648679185 has 240 divisors, whose sum is σ = 1532568576. Its totient is φ = 256608000.

The previous prime is 648679181. The next prime is 648679211. The reversal of 648679185 is 581976846.

It is not a de Polignac number, because 648679185 - 2² = 648679181 is a prime.

It is not an unprimeable number, because it can be changed into a prime (648679181) 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 239 ways as a sum of consecutive naturals, for example, 10634055 + ... + 10634115.

Almost surely, 2^648679185 is an apocalyptic number.

It is an amenable number.

648679185 is an abundant number, since it is smaller than the sum of its proper divisors (883889391).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648679185 is a wasteful number, since it uses less digits than its factorization.

648679185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 118 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 648679185 is about 25469.1810822413. The cubic root of 648679185 is about 865.6519681850.

The spelling of 648679185 in words is "six hundred forty-eight million, six hundred seventy-nine thousand, one hundred eighty-five".