2678641 has 4 divisors (see below), whose sum is σ = 3061312. Its totient is φ = 2295972.

The previous prime is 2678629. The next prime is 2678651. The reversal of 2678641 is 1468762.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1468762 = 2 ⋅734381.

It is not a de Polignac number, because 2678641 - 2¹¹ = 2676593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2678597 and 2678606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2678651) 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, 191325 + ... + 191338.

It is an arithmetic number, because the mean of its divisors is an integer number (765328).

2^2678641 is an apocalyptic number.

It is an amenable number.

2678641 is a deficient number, since it is larger than the sum of its proper divisors (382671).

2678641 is an equidigital number, since it uses as much as digits as its factorization.

2678641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382670.

The product of its digits is 16128, while the sum is 34.

The square root of 2678641 is about 1636.6554310544. The cubic root of 2678641 is about 138.8795084391.

The spelling of 2678641 in words is "two million, six hundred seventy-eight thousand, six hundred forty-one".