2564605 has 4 divisors (see below), whose sum is σ = 3077532. Its totient is φ = 2051680.

The previous prime is 2564593. The next prime is 2564609. The reversal of 2564605 is 5064652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 356409 + 2208196 = 597^2 + 1486^2 .

It is not a de Polignac number, because 2564605 - 2¹¹ = 2562557 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564609) 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 3 ways as a sum of consecutive naturals, for example, 256456 + ... + 256465.

It is an arithmetic number, because the mean of its divisors is an integer number (769383).

2^2564605 is an apocalyptic number.

It is an amenable number.

2564605 is a deficient number, since it is larger than the sum of its proper divisors (512927).

2564605 is an equidigital number, since it uses as much as digits as its factorization.

2564605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512926.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 2564605 is about 1601.4384159249. The cubic root of 2564605 is about 136.8800520087.

It can be divided in two parts, 256 and 4605, that multiplied together give a triangular number (1178880 = T₁₅₃₅).

The spelling of 2564605 in words is "two million, five hundred sixty-four thousand, six hundred five".