2563649 has 8 divisors (see below), whose sum is σ = 2918592. Its totient is φ = 2229040.

The previous prime is 2563643. The next prime is 2563657. The reversal of 2563649 is 9463652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2563649 - 2⁴ = 2563633 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4814 + ... + 5319.

It is an arithmetic number, because the mean of its divisors is an integer number (364824).

2^2563649 is an apocalyptic number.

It is an amenable number.

2563649 is a deficient number, since it is larger than the sum of its proper divisors (354943).

2563649 is a wasteful number, since it uses less digits than its factorization.

2563649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10167.

The product of its digits is 38880, while the sum is 35.

The square root of 2563649 is about 1601.1399064417. The cubic root of 2563649 is about 136.8630417748.

The spelling of 2563649 in words is "two million, five hundred sixty-three thousand, six hundred forty-nine".