649605 has 32 divisors (see below), whose sum is σ = 1179648. Its totient is φ = 302400.

The previous prime is 649577. The next prime is 649613. The reversal of 649605 is 506946.

649605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 649605 - 2⁵ = 649573 is a prime.

It is a Curzon number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5052 + ... + 5178.

It is an arithmetic number, because the mean of its divisors is an integer number (36864).

2⁶⁴⁹⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

649605 is a deficient number, since it is larger than the sum of its proper divisors (530043).

649605 is a wasteful number, since it uses less digits than its factorization.

649605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 649605 is about 805.9807690013. The cubic root of 649605 is about 86.6063600838.

Adding to 649605 its product of nonzero digits (6480), we get a triangular number (656085 = T₁₁₄₅).

It can be divided in two parts, 64 and 9605, that added together give a palindrome (9669).

The spelling of 649605 in words is "six hundred forty-nine thousand, six hundred five".