26181980 has 72 divisors (see below), whose sum is σ = 62563200. Its totient is φ = 9187200.

The previous prime is 26181973. The next prime is 26181997. The reversal of 26181980 is 8918162.

It is a self number, because there is not a number n which added to its sum of digits gives 26181980.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74846 + ... + 75194.

Almost surely, 2^26181980 is an apocalyptic number.

26181980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26181980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31281600).

26181980 is an abundant number, since it is smaller than the sum of its proper divisors (36381220).

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

26181980 is a wasteful number, since it uses less digits than its factorization.

26181980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 26181980 is about 5116.8330048967. The cubic root of 26181980 is about 296.9391736431.

The spelling of 26181980 in words is "twenty-six million, one hundred eighty-one thousand, nine hundred eighty".