2563646 has 4 divisors (see below), whose sum is σ = 3845472. Its totient is φ = 1281822.

The previous prime is 2563643. The next prime is 2563657. The reversal of 2563646 is 6463652.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2563643) 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 as a sum of consecutive naturals, namely, 640910 + ... + 640913.

It is an arithmetic number, because the mean of its divisors is an integer number (961368).

2^2563646 is an apocalyptic number.

2563646 is a deficient number, since it is larger than the sum of its proper divisors (1281826).

2563646 is a wasteful number, since it uses less digits than its factorization.

2563646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281825.

The product of its digits is 25920, while the sum is 32.

The square root of 2563646 is about 1601.1389696088. The cubic root of 2563646 is about 136.8629883888.

The spelling of 2563646 in words is "two million, five hundred sixty-three thousand, six hundred forty-six".