2681604 has 18 divisors (see below), whose sum is σ = 6778590. Its totient is φ = 893856.

The previous prime is 2681579. The next prime is 2681611. The reversal of 2681604 is 4061862.

It can be written as a sum of positive squares in only one way, i.e., 2433600 + 248004 = 1560^2 + 498^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37209 + ... + 37280.

2^2681604 is an apocalyptic number.

It is an amenable number.

2681604 is an abundant number, since it is smaller than the sum of its proper divisors (4096986).

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

2681604 is a wasteful number, since it uses less digits than its factorization.

2681604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74499 (or 74494 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 2681604 is about 1637.5603805662. The cubic root of 2681604 is about 138.9306971262.

The spelling of 2681604 in words is "two million, six hundred eighty-one thousand, six hundred four".