2720656 has 20 divisors (see below), whose sum is σ = 5328652. Its totient is φ = 1345536.

The previous prime is 2720623. The next prime is 2720671. The reversal of 2720656 is 6560272.

It can be written as a sum of positive squares in 2 ways, for example, as 518400 + 2202256 = 720^2 + 1484^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 676 + ... + 2428.

2^2720656 is an apocalyptic number.

It is an amenable number.

2720656 is a deficient number, since it is larger than the sum of its proper divisors (2607996).

2720656 is a wasteful number, since it uses less digits than its factorization.

2720656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1858 (or 1852 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 2720656 is about 1649.4411174698. The cubic root of 2720656 is about 139.6018620288.

The spelling of 2720656 in words is "two million, seven hundred twenty thousand, six hundred fifty-six".