2643645 has 8 divisors (see below), whose sum is σ = 4229856. Its totient is φ = 1409936.

The previous prime is 2643629. The next prime is 2643647. The reversal of 2643645 is 5463462.

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 2643645 - 2⁴ = 2643629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88107 + ... + 88136.

It is an arithmetic number, because the mean of its divisors is an integer number (528732).

2^2643645 is an apocalyptic number.

It is an amenable number.

2643645 is a deficient number, since it is larger than the sum of its proper divisors (1586211).

2643645 is a wasteful number, since it uses less digits than its factorization.

2643645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176251.

The product of its digits is 17280, while the sum is 30.

The square root of 2643645 is about 1625.9289652380. The cubic root of 2643645 is about 138.2720426536.

The spelling of 2643645 in words is "two million, six hundred forty-three thousand, six hundred forty-five".