2561808 has 60 divisors (see below), whose sum is σ = 7100240. Its totient is φ = 793728.

The previous prime is 2561807. The next prime is 2561813. The reversal of 2561808 is 8081652.

It is not an unprimeable number, because it can be changed into a prime (2561807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48310 + ... + 48362.

2^2561808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2561808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3550120).

2561808 is an abundant number, since it is smaller than the sum of its proper divisors (4538432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2561808 is a wasteful number, since it uses less digits than its factorization.

2561808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 2561808 is about 1600.5649002774. The cubic root of 2561808 is about 136.8302727026.

The spelling of 2561808 in words is "two million, five hundred sixty-one thousand, eight hundred eight".