26277139878 has 64 divisors (see below), whose sum is σ = 60398714880. Its totient is φ = 7537514400.

The previous prime is 26277139873. The next prime is 26277139913. The reversal of 26277139878 is 87893177262.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26277139873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1656163 + ... + 1671953.

It is an arithmetic number, because the mean of its divisors is an integer number (943729920).

Almost surely, 2^26277139878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26277139878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30199357440).

26277139878 is an abundant number, since it is smaller than the sum of its proper divisors (34121575002).

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

26277139878 is a wasteful number, since it uses less digits than its factorization.

26277139878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17153.

The product of its digits is 14224896, while the sum is 60.

The spelling of 26277139878 in words is "twenty-six billion, two hundred seventy-seven million, one hundred thirty-nine thousand, eight hundred seventy-eight".