26661280 has 48 divisors (see below), whose sum is σ = 63318024. Its totient is φ = 10608640.

The previous prime is 26661259. The next prime is 26661289. The reversal of 26661280 is 8216662.

It can be written as a sum of positive squares in 4 ways, for example, as 24088464 + 2572816 = 4908^2 + 1604^2 .

It is not an unprimeable number, because it can be changed into a prime (26661289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44664 + ... + 45256.

Almost surely, 2^26661280 is an apocalyptic number.

26661280 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 26661280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31659012).

26661280 is an abundant number, since it is smaller than the sum of its proper divisors (36656744).

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

26661280 is a wasteful number, since it uses less digits than its factorization.

26661280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889 (or 881 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 26661280 is about 5163.4562068444. The cubic root of 26661280 is about 298.7401985545.

The spelling of 26661280 in words is "twenty-six million, six hundred sixty-one thousand, two hundred eighty".