2645687 has 4 divisors (see below), whose sum is σ = 2886216. Its totient is φ = 2405160.

The previous prime is 2645681. The next prime is 2645701. The reversal of 2645687 is 7865462.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2645687 - 2⁸ = 2645431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2645687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120248 + ... + 120269.

It is an arithmetic number, because the mean of its divisors is an integer number (721554).

2^2645687 is an apocalyptic number.

2645687 is a deficient number, since it is larger than the sum of its proper divisors (240529).

2645687 is a wasteful number, since it uses less digits than its factorization.

2645687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240528.

The product of its digits is 80640, while the sum is 38.

The square root of 2645687 is about 1626.5567927373. The cubic root of 2645687 is about 138.3076347804.

The spelling of 2645687 in words is "two million, six hundred forty-five thousand, six hundred eighty-seven".