11271280 has 20 divisors (see below), whose sum is σ = 26205912. Its totient is φ = 4508480.

The previous prime is 11271277. The next prime is 11271319. The reversal of 11271280 is 8217211.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70366 + ... + 70525.

Almost surely, 2^11271280 is an apocalyptic number.

11271280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11271280 is an abundant number, since it is smaller than the sum of its proper divisors (14934632).

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

11271280 is a wasteful number, since it uses less digits than its factorization.

11271280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140904 (or 140898 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 11271280 is about 3357.2727026561. The cubic root of 11271280 is about 224.2114287755.

Adding to 11271280 its reverse (8217211), we get a palindrome (19488491).

The spelling of 11271280 in words is "eleven million, two hundred seventy-one thousand, two hundred eighty".