2644681 has 6 divisors (see below), whose sum is σ = 2863950. Its totient is φ = 2441088.

The previous prime is 2644669. The next prime is 2644687. The reversal of 2644681 is 1864462.

It can be written as a sum of positive squares in 3 ways, for example, as 84681 + 2560000 = 291^2 + 1600^2 .

It is not a de Polignac number, because 2644681 - 2²¹ = 547529 is a prime.

It is a super-2 number, since 2×2644681² = 13988675183522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2644687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7656 + ... + 7993.

It is an arithmetic number, because the mean of its divisors is an integer number (477325).

2^2644681 is an apocalyptic number.

It is an amenable number.

2644681 is a deficient number, since it is larger than the sum of its proper divisors (219269).

2644681 is a wasteful number, since it uses less digits than its factorization.

2644681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15675 (or 15662 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 2644681 is about 1626.2475211357. The cubic root of 2644681 is about 138.2901024571.

The spelling of 2644681 in words is "two million, six hundred forty-four thousand, six hundred eighty-one".