2721656 has 48 divisors (see below), whose sum is σ = 6094440. Its totient is φ = 1135680.

The previous prime is 2721619. The next prime is 2721671. The reversal of 2721656 is 6561272.

2721656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2721656² = 14814822764672, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20711 + ... + 20841.

2^2721656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2721656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3047220).

2721656 is an abundant number, since it is smaller than the sum of its proper divisors (3372784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2721656 is a wasteful number, since it uses less digits than its factorization.

2721656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 193 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 2721656 is about 1649.7442225994. The cubic root of 2721656 is about 139.6189638800.

It can be divided in two parts, 27216 and 56, that added together give a palindrome (27272).

The spelling of 2721656 in words is "two million, seven hundred twenty-one thousand, six hundred fifty-six".