2561408 has 16 divisors (see below), whose sum is σ = 5103060. Its totient is φ = 1280640.

The previous prime is 2561401. The next prime is 2561411. The reversal of 2561408 is 8041652.

It is a tau number, because it is divible by the number of its divisors (16).

2561408 is a modest number, since divided by 1408 gives 256 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9878 + ... + 10133.

2^2561408 is an apocalyptic number.

It is an amenable number.

2561408 is a deficient number, since it is larger than the sum of its proper divisors (2541652).

2561408 is an equidigital number, since it uses as much as digits as its factorization.

2561408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20025 (or 20013 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2561408 is about 1600.4399395166. The cubic root of 2561408 is about 136.8231507848.

The spelling of 2561408 in words is "two million, five hundred sixty-one thousand, four hundred eight".