648512685 has 24 divisors (see below), whose sum is σ = 1190212920. Its totient is φ = 325527552.

The previous prime is 648512671. The next prime is 648512707. The reversal of 648512685 is 586215846.

648512685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 117809316 + 530703369 = 10854^2 + 23037^2 .

It is not a de Polignac number, because 648512685 - 2⁹ = 648512173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 648512685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 423100 + ... + 424629.

It is an arithmetic number, because the mean of its divisors is an integer number (49592205).

Almost surely, 2^648512685 is an apocalyptic number.

It is an amenable number.

648512685 is a deficient number, since it is larger than the sum of its proper divisors (541700235).

648512685 is a wasteful number, since it uses less digits than its factorization.

648512685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847757 (or 847754 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The square root of 648512685 is about 25465.9122161371. The cubic root of 648512685 is about 865.5778979875.

The spelling of 648512685 in words is "six hundred forty-eight million, five hundred twelve thousand, six hundred eighty-five".