26721280 has 88 divisors (see below), whose sum is σ = 68091408. Its totient is φ = 10027008.

The previous prime is 26721257. The next prime is 26721281. The reversal of 26721280 is 8212762.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26721281) 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, 86887 + ... + 87193.

It is an arithmetic number, because the mean of its divisors is an integer number (773766).

Almost surely, 2^26721280 is an apocalyptic number.

26721280 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 26721280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34045704).

26721280 is an abundant number, since it is smaller than the sum of its proper divisors (41370128).

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

26721280 is a wasteful number, since it uses less digits than its factorization.

26721280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 26721280 is about 5169.2630035625. The cubic root of 26721280 is about 298.9641310723.

The spelling of 26721280 in words is "twenty-six million, seven hundred twenty-one thousand, two hundred eighty".