26878487861 has 32 divisors (see below), whose sum is σ = 29455695360. Its totient is φ = 24448241664.

The previous prime is 26878487851. The next prime is 26878487863. The reversal of 26878487861 is 16878487862.

It is a de Polignac number, because none of the positive numbers 2^k-26878487861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26878487863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15073976 + ... + 15075758.

It is an arithmetic number, because the mean of its divisors is an integer number (920490480).

Almost surely, 2^26878487861 is an apocalyptic number.

It is an amenable number.

26878487861 is a deficient number, since it is larger than the sum of its proper divisors (2577207499).

26878487861 is a wasteful number, since it uses less digits than its factorization.

26878487861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165.

The product of its digits is 57802752, while the sum is 65.

Subtracting from 26878487861 its reverse (16878487862), we obtain a palindrome (9999999999).

The spelling of 26878487861 in words is "twenty-six billion, eight hundred seventy-eight million, four hundred eighty-seven thousand, eight hundred sixty-one".