648205 has 4 divisors (see below), whose sum is σ = 777852. Its totient is φ = 518560.

The previous prime is 648199. The next prime is 648211. The reversal of 648205 is 502846.

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

It is an interprime number because it is at equal distance from previous prime (648199) and next prime (648211).

It can be written as a sum of positive squares in 2 ways, for example, as 149769 + 498436 = 387^2 + 706^2 .

It is not a de Polignac number, because 648205 - 2⁵ = 648173 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 648205.

It is a congruent number.

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, 64816 + ... + 64825.

It is an arithmetic number, because the mean of its divisors is an integer number (194463).

2⁶⁴⁸²⁰⁵ is an apocalyptic number.

It is an amenable number.

648205 is a deficient number, since it is larger than the sum of its proper divisors (129647).

648205 is a wasteful number, since it uses less digits than its factorization.

648205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129646.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 648205 is about 805.1117934796. Note that the first 3 decimals coincide. The cubic root of 648205 is about 86.5440986008.

The spelling of 648205 in words is "six hundred forty-eight thousand, two hundred five".