648705 has 16 divisors (see below), whose sum is σ = 1056960. Its totient is φ = 339648.

The previous prime is 648689. The next prime is 648709. The reversal of 648705 is 507846.

It is a happy number.

It is not a de Polignac number, because 648705 - 2⁴ = 648689 is a prime.

It is a Curzon number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (648709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 519 + ... + 1251.

It is an arithmetic number, because the mean of its divisors is an integer number (66060).

2⁶⁴⁸⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

648705 is a deficient number, since it is larger than the sum of its proper divisors (408255).

648705 is a wasteful number, since it uses less digits than its factorization.

648705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 648705 is about 805.4222495064. The cubic root of 648705 is about 86.5663451267.

It can be divided in two parts, 6 and 48705, that multiplied together give a triangular number (292230 = T₇₆₄).

The spelling of 648705 in words is "six hundred forty-eight thousand, seven hundred five".