2721663 has 12 divisors (see below), whose sum is σ = 4493008. Its totient is φ = 1555200.

The previous prime is 2721619. The next prime is 2721671. The reversal of 2721663 is 3661272.

It is a happy number.

It is not a de Polignac number, because 2721663 - 2¹² = 2717567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21538 + ... + 21663.

2^2721663 is an apocalyptic number.

2721663 is a deficient number, since it is larger than the sum of its proper divisors (1771345).

2721663 is a wasteful number, since it uses less digits than its factorization.

2721663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43214 (or 43211 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 2721663 is about 1649.7463441390. The cubic root of 2721663 is about 139.6190835782.

The spelling of 2721663 in words is "two million, seven hundred twenty-one thousand, six hundred sixty-three".