2721604 has 6 divisors (see below), whose sum is σ = 4762814. Its totient is φ = 1360800.

The previous prime is 2721577. The next prime is 2721619. The reversal of 2721604 is 4061272.

It can be written as a sum of positive squares in only one way, i.e., 2560000 + 161604 = 1600^2 + 402^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340197 + ... + 340204.

2^2721604 is an apocalyptic number.

It is an amenable number.

2721604 is a deficient number, since it is larger than the sum of its proper divisors (2041210).

2721604 is a wasteful number, since it uses less digits than its factorization.

2721604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680405 (or 680403 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 2721604 is about 1649.7284625053. The cubic root of 2721604 is about 139.6180746870.

Adding to 2721604 its reverse (4061272), we get a palindrome (6782876).

The spelling of 2721604 in words is "two million, seven hundred twenty-one thousand, six hundred four".