2613645 has 18 divisors (see below), whose sum is σ = 4549194. Its totient is φ = 1388160.

The previous prime is 2613613. The next prime is 2613647. The reversal of 2613645 is 5463162.

2613645 is a `hidden beast` number, since 2 + 6 + 13 + 645 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 799236 + 1814409 = 894^2 + 1347^2 .

It is not a de Polignac number, because 2613645 - 2⁵ = 2613613 is a prime.

It is a super-3 number, since 3×2613645³ = 53562526174509933375, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2613647) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10725 + ... + 10965.

It is an arithmetic number, because the mean of its divisors is an integer number (252733).

2^2613645 is an apocalyptic number.

It is an amenable number.

2613645 is a deficient number, since it is larger than the sum of its proper divisors (1935549).

2613645 is an equidigital number, since it uses as much as digits as its factorization.

2613645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493 (or 249 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 2613645 is about 1616.6771477323. The cubic root of 2613645 is about 137.7470160300.

The spelling of 2613645 in words is "two million, six hundred thirteen thousand, six hundred forty-five".