613664 has 24 divisors (see below), whose sum is σ = 1225728. Its totient is φ = 302400.

The previous prime is 613661. The next prime is 613667. The reversal of 613664 is 466316.

It is an interprime number because it is at equal distance from previous prime (613661) and next prime (613667).

Its product of digits (2592) is a multiple of the sum of its prime factors (288).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 613664.

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 3 ways as a sum of consecutive naturals, for example, 3989 + ... + 4139.

It is an arithmetic number, because the mean of its divisors is an integer number (51072).

2⁶¹³⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

613664 is a deficient number, since it is larger than the sum of its proper divisors (612064).

613664 is a wasteful number, since it uses less digits than its factorization.

613664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 280 counting only the distinct ones).

The product of its digits is 2592, while the sum is 26.

The square root of 613664 is about 783.3670914712. The cubic root of 613664 is about 84.9787259331.

The spelling of 613664 in words is "six hundred thirteen thousand, six hundred sixty-four".