2681645 has 8 divisors (see below), whose sum is σ = 3230304. Its totient is φ = 2137104.

The previous prime is 2681617. The next prime is 2681663. The reversal of 2681645 is 5461862.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2681645 - 2⁸ = 2681389 is a prime.

It is a super-3 number, since 3×2681645³ = 57852896714677233375, which contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 662 + ... + 2408.

It is an arithmetic number, because the mean of its divisors is an integer number (403788).

2^2681645 is an apocalyptic number.

It is an amenable number.

2681645 is a deficient number, since it is larger than the sum of its proper divisors (548659).

2681645 is a wasteful number, since it uses less digits than its factorization.

2681645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059.

The product of its digits is 11520, while the sum is 32.

The square root of 2681645 is about 1637.5728991407. The cubic root of 2681645 is about 138.9314051763.

The spelling of 2681645 in words is "two million, six hundred eighty-one thousand, six hundred forty-five".