613665 has 24 divisors (see below), whose sum is σ = 1146600. Its totient is φ = 301824.

The previous prime is 613661. The next prime is 613667. The reversal of 613665 is 566316.

It can be written as a sum of positive squares in 4 ways, for example, as 77841 + 535824 = 279^2 + 732^2 .

It is not a de Polignac number, because 613665 - 2² = 613661 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 613665.

It is not an unprimeable number, because it can be changed into a prime (613661) 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, 61 + ... + 1109.

It is an arithmetic number, because the mean of its divisors is an integer number (47775).

2⁶¹³⁶⁶⁵ is an apocalyptic number.

613665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

613665 is a deficient number, since it is larger than the sum of its proper divisors (532935).

613665 is a wasteful number, since it uses less digits than its factorization.

613665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073 (or 1070 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 613665 is about 783.3677297413. The cubic root of 613665 is about 84.9787720923.

The spelling of 613665 in words is "six hundred thirteen thousand, six hundred sixty-five".