26509980 has 144 divisors (see below), whose sum is σ = 88252416. Its totient is φ = 5927040.

The previous prime is 26509979. The next prime is 26509993. The reversal of 26509980 is 8990562.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 208677 + ... + 208803.

It is an arithmetic number, because the mean of its divisors is an integer number (612864).

Almost surely, 2^26509980 is an apocalyptic number.

26509980 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 26509980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44126208).

26509980 is an abundant number, since it is smaller than the sum of its proper divisors (61742436).

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

26509980 is a wasteful number, since it uses less digits than its factorization.

26509980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 26509980 is about 5148.7843225367. The cubic root of 26509980 is about 298.1740196458.

The spelling of 26509980 in words is "twenty-six million, five hundred nine thousand, nine hundred eighty".