2604689 has 16 divisors (see below), whose sum is σ = 2930256. Its totient is φ = 2304000.

The previous prime is 2604683. The next prime is 2604703. The reversal of 2604689 is 9864062.

It can be written as a sum of positive squares in 8 ways, for example, as 369664 + 2235025 = 608^2 + 1495^2 .

It is a cyclic number.

It is not a de Polignac number, because 2604689 - 2¹² = 2600593 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2604683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25739 + ... + 25839.

It is an arithmetic number, because the mean of its divisors is an integer number (183141).

2^2604689 is an apocalyptic number.

It is an amenable number.

2604689 is a deficient number, since it is larger than the sum of its proper divisors (325567).

2604689 is a wasteful number, since it uses less digits than its factorization.

2604689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 2604689 is about 1613.9048918694. The cubic root of 2604689 is about 137.5894998579.

The spelling of 2604689 in words is "two million, six hundred four thousand, six hundred eighty-nine".