2564635 has 4 divisors (see below), whose sum is σ = 3077568. Its totient is φ = 2051704.

The previous prime is 2564633. The next prime is 2564651. The reversal of 2564635 is 5364652.

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

It is a cyclic number.

It is not a de Polignac number, because 2564635 - 2¹ = 2564633 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 d-powerful number, because it can be written as 2¹⁹ + 5⁷ + 6³ + 4⁵ + 6⁴ + 3⁸ + 5⁹ .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2564597 and 2564606.

It is not an unprimeable number, because it can be changed into a prime (2564633) 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, 256459 + ... + 256468.

It is an arithmetic number, because the mean of its divisors is an integer number (769392).

2^2564635 is an apocalyptic number.

2564635 is a deficient number, since it is larger than the sum of its proper divisors (512933).

2564635 is an equidigital number, since it uses as much as digits as its factorization.

2564635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512932.

The product of its digits is 21600, while the sum is 31.

The square root of 2564635 is about 1601.4477824768. The cubic root of 2564635 is about 136.8805857343.

The spelling of 2564635 in words is "two million, five hundred sixty-four thousand, six hundred thirty-five".