2661878 has 8 divisors (see below), whose sum is σ = 4000440. Its totient is φ = 1328400.

The previous prime is 2661871. The next prime is 2661899. The reversal of 2661878 is 8781662.

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

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578 + ... + 2378.

It is an arithmetic number, because the mean of its divisors is an integer number (500055).

2^2661878 is an apocalyptic number.

2661878 is a deficient number, since it is larger than the sum of its proper divisors (1338562).

2661878 is a wasteful number, since it uses less digits than its factorization.

2661878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2542.

The product of its digits is 32256, while the sum is 38.

The square root of 2661878 is about 1631.5262792857. The cubic root of 2661878 is about 138.5891982334.

The spelling of 2661878 in words is "two million, six hundred sixty-one thousand, eight hundred seventy-eight".