648785 has 4 divisors (see below), whose sum is σ = 778548. Its totient is φ = 519024.

The previous prime is 648779. The next prime is 648803. The reversal of 648785 is 587846.

648785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 124609 + 524176 = 353^2 + 724^2 .

It is a cyclic number.

It is not a de Polignac number, because 648785 - 2¹⁶ = 583249 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 648785.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64874 + ... + 64883.

It is an arithmetic number, because the mean of its divisors is an integer number (194637).

2⁶⁴⁸⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

648785 is a deficient number, since it is larger than the sum of its proper divisors (129763).

648785 is a wasteful number, since it uses less digits than its factorization.

648785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129762.

The product of its digits is 53760, while the sum is 38.

The square root of 648785 is about 805.4719113662. The cubic root of 648785 is about 86.5699035099.

The spelling of 648785 in words is "six hundred forty-eight thousand, seven hundred eighty-five".