26781678 has 160 divisors (see below), whose sum is σ = 79453440. Its totient is φ = 6531840.

The previous prime is 26781661. The next prime is 26781679. The reversal of 26781678 is 87618762.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26781679) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 236950 + ... + 237062.

It is an arithmetic number, because the mean of its divisors is an integer number (496584).

Almost surely, 2^26781678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26781678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39726720).

26781678 is an abundant number, since it is smaller than the sum of its proper divisors (52671762).

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

26781678 is a wasteful number, since it uses less digits than its factorization.

26781678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 155 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 26781678 is about 5175.1017381304. The cubic root of 26781678 is about 299.1892107098.

It can be divided in two parts, 2678 and 1678, that added together give a square (4356 = 66²).

The spelling of 26781678 in words is "twenty-six million, seven hundred eighty-one thousand, six hundred seventy-eight".