2581648 has 20 divisors (see below), whose sum is σ = 5027580. Its totient is φ = 1284224.

The previous prime is 2581643. The next prime is 2581651. The reversal of 2581648 is 8461852.

It can be written as a sum of positive squares in 2 ways, for example, as 1024144 + 1557504 = 1012^2 + 1248^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2581643) 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, 4818 + ... + 5326.

It is an arithmetic number, because the mean of its divisors is an integer number (251379).

2^2581648 is an apocalyptic number.

It is an amenable number.

2581648 is a deficient number, since it is larger than the sum of its proper divisors (2445932).

2581648 is a wasteful number, since it uses less digits than its factorization.

2581648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834 (or 828 counting only the distinct ones).

The product of its digits is 15360, while the sum is 34.

The square root of 2581648 is about 1606.7507585186. The cubic root of 2581648 is about 137.1825934789.

The spelling of 2581648 in words is "two million, five hundred eighty-one thousand, six hundred forty-eight".