2561878 has 32 divisors (see below), whose sum is σ = 4499712. Its totient is φ = 1082400.

The previous prime is 2561873. The next prime is 2561899. The reversal of 2561878 is 8781652.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30825 + ... + 30907.

It is an arithmetic number, because the mean of its divisors is an integer number (140616).

2^2561878 is an apocalyptic number.

2561878 is a deficient number, since it is larger than the sum of its proper divisors (1937834).

2561878 is a wasteful number, since it uses less digits than its factorization.

2561878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180.

The product of its digits is 26880, while the sum is 37.

The square root of 2561878 is about 1600.5867674075. The cubic root of 2561878 is about 136.8315189620.

The spelling of 2561878 in words is "two million, five hundred sixty-one thousand, eight hundred seventy-eight".