649565 has 16 divisors (see below), whose sum is σ = 907392. Its totient is φ = 437184.

The previous prime is 649559. The next prime is 649567. The reversal of 649565 is 565946.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 649565 - 2⁶ = 649501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649565.

It is not an unprimeable number, because it can be changed into a prime (649567) 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, 2207 + ... + 2483.

It is an arithmetic number, because the mean of its divisors is an integer number (56712).

2⁶⁴⁹⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

649565 is a deficient number, since it is larger than the sum of its proper divisors (257827).

649565 is a wasteful number, since it uses less digits than its factorization.

649565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356.

The product of its digits is 32400, while the sum is 35.

The square root of 649565 is about 805.9559541315. The cubic root of 649565 is about 86.6045824264.

The spelling of 649565 in words is "six hundred forty-nine thousand, five hundred sixty-five".