2604649 has 4 divisors (see below), whose sum is σ = 2610900. Its totient is φ = 2598400.

The previous prime is 2604647. The next prime is 2604661. The reversal of 2604649 is 9464062.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9464062 = 2 ⋅4732031.

It can be written as a sum of positive squares in 2 ways, for example, as 2205225 + 399424 = 1485^2 + 632^2 .

It is a cyclic number.

It is not a de Polignac number, because 2604649 - 2¹ = 2604647 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2604649.

It is not an unprimeable number, because it can be changed into a prime (2604647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2452 + ... + 3349.

It is an arithmetic number, because the mean of its divisors is an integer number (652725).

2^2604649 is an apocalyptic number.

It is an amenable number.

2604649 is a deficient number, since it is larger than the sum of its proper divisors (6251).

2604649 is an equidigital number, since it uses as much as digits as its factorization.

2604649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6250.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 2604649 is about 1613.8924995179. The cubic root of 2604649 is about 137.5887955373.

The spelling of 2604649 in words is "two million, six hundred four thousand, six hundred forty-nine".