2678649 has 8 divisors (see below), whose sum is σ = 3726912. Its totient is φ = 1708080.

The previous prime is 2678629. The next prime is 2678651. The reversal of 2678649 is 9468762.

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

It is not a de Polignac number, because 2678649 - 2¹³ = 2670457 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2678649.

It is not an unprimeable number, because it can be changed into a prime (2678629) 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, 19342 + ... + 19479.

It is an arithmetic number, because the mean of its divisors is an integer number (465864).

2^2678649 is an apocalyptic number.

It is an amenable number.

2678649 is a deficient number, since it is larger than the sum of its proper divisors (1048263).

2678649 is a wasteful number, since it uses less digits than its factorization.

2678649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38847.

The product of its digits is 145152, while the sum is 42.

The square root of 2678649 is about 1636.6578750612. The cubic root of 2678649 is about 138.8796466976.

The spelling of 2678649 in words is "two million, six hundred seventy-eight thousand, six hundred forty-nine".