2722681 has 16 divisors (see below), whose sum is σ = 3149440. Its totient is φ = 2332800.

The previous prime is 2722661. The next prime is 2722691. The reversal of 2722681 is 1862272.

It is a 3-Lehmer number, since φ(2722681) divides (2722681-1)³.

It is a cyclic number.

It is not a de Polignac number, because 2722681 - 2⁷ = 2722553 is a prime.

It is a super-2 number, since 2×2722681² = 14825983655522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2722661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17956 + ... + 18106.

It is an arithmetic number, because the mean of its divisors is an integer number (196840).

It is a Poulet number, since it divides 2^2722680-1.

2^2722681 is an apocalyptic number.

It is an amenable number.

2722681 is a deficient number, since it is larger than the sum of its proper divisors (426759).

2722681 is a wasteful number, since it uses less digits than its factorization.

2722681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256.

The product of its digits is 2688, while the sum is 28.

The square root of 2722681 is about 1650.0548475733. The cubic root of 2722681 is about 139.6364889304.

It can be divided in two parts, 2722 and 681, that added together give a triangular number (3403 = T₈₂).

The spelling of 2722681 in words is "two million, seven hundred twenty-two thousand, six hundred eighty-one".