648781005 has 8 divisors (see below), whose sum is σ = 1038049632. Its totient is φ = 346016528.

The previous prime is 648780961. The next prime is 648781009. The reversal of 648781005 is 500187846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 648781005 - 2¹⁸ = 648518861 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648781009) 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 in 7 ways as a sum of consecutive naturals, for example, 21626019 + ... + 21626048.

It is an arithmetic number, because the mean of its divisors is an integer number (129756204).

Almost surely, 2^648781005 is an apocalyptic number.

It is an amenable number.

648781005 is a deficient number, since it is larger than the sum of its proper divisors (389268627).

648781005 is a wasteful number, since it uses less digits than its factorization.

648781005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43252075.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 648781005 is about 25471.1798902210. The cubic root of 648781005 is about 865.6972582011.

The spelling of 648781005 in words is "six hundred forty-eight million, seven hundred eighty-one thousand, five".