648505 has 16 divisors (see below), whose sum is σ = 915264. Its totient is φ = 434880.

The previous prime is 648481. The next prime is 648509. The reversal of 648505 is 505846.

It is not a de Polignac number, because 648505 - 2⁷ = 648377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262 + ... + 1168.

It is an arithmetic number, because the mean of its divisors is an integer number (57204).

2⁶⁴⁸⁵⁰⁵ is an apocalyptic number.

648505 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

648505 is a deficient number, since it is larger than the sum of its proper divisors (266759).

648505 is a wasteful number, since it uses less digits than its factorization.

648505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 648505 is about 805.2980814580. The cubic root of 648505 is about 86.5574478886.

The spelling of 648505 in words is "six hundred forty-eight thousand, five hundred five".