11571280 has 40 divisors (see below), whose sum is σ = 30748032. Its totient is φ = 3967104.

The previous prime is 11571251. The next prime is 11571283. The reversal of 11571280 is 8217511.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11571283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9772 + ... + 10891.

Almost surely, 2^11571280 is an apocalyptic number.

11571280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11571280 is an abundant number, since it is smaller than the sum of its proper divisors (19176752).

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

11571280 is a wasteful number, since it uses less digits than its factorization.

11571280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20683 (or 20677 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 11571280 is about 3401.6584190656. The cubic root of 11571280 is about 226.1832643033.

Adding to 11571280 its reverse (8217511), we get a palindrome (19788791).

The spelling of 11571280 in words is "eleven million, five hundred seventy-one thousand, two hundred eighty".