613645 has 16 divisors (see below), whose sum is σ = 787968. Its totient is φ = 457920.

The previous prime is 613637. The next prime is 613651. The reversal of 613645 is 546316.

613645 = T₉₀ + T₉₁ + ... + T₁₆₃.

613645 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 613645 - 2³ = 613637 is a prime.

It is a super-3 number, since 3×613645³ = 693222826059933375, which contains 333 as substring.

It is a Duffinian number.

Its product of digits (2160) is a multiple of the sum of its prime divisors (180).

It is a plaindrome in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5682 + ... + 5788.

It is an arithmetic number, because the mean of its divisors is an integer number (49248).

2⁶¹³⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

613645 is a deficient number, since it is larger than the sum of its proper divisors (174323).

613645 is a wasteful number, since it uses less digits than its factorization.

613645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180.

The product of its digits is 2160, while the sum is 25.

The square root of 613645 is about 783.3549642403. The cubic root of 613645 is about 84.9778488992.

The spelling of 613645 in words is "six hundred thirteen thousand, six hundred forty-five".