649005 has 24 divisors (see below), whose sum is σ = 1209312. Its totient is φ = 296352.

The previous prime is 649001. The next prime is 649007. The reversal of 649005 is 500946.

It is not a de Polignac number, because 649005 - 2² = 649001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 294 + ... + 1176.

It is an arithmetic number, because the mean of its divisors is an integer number (50388).

2⁶⁴⁹⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

649005 is a deficient number, since it is larger than the sum of its proper divisors (560307).

649005 is a wasteful number, since it uses less digits than its factorization.

649005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905 (or 898 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 649005 is about 805.6084656953. The cubic root of 649005 is about 86.5796875557.

The spelling of 649005 in words is "six hundred forty-nine thousand, five".