11711280 has 80 divisors (see below), whose sum is σ = 41497344. Its totient is φ = 2676480.

The previous prime is 11711263. The next prime is 11711303. The reversal of 11711280 is 8211711.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1806 + ... + 5165.

Almost surely, 2^11711280 is an apocalyptic number.

11711280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11711280 is an abundant number, since it is smaller than the sum of its proper divisors (29786064).

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

11711280 is a wasteful number, since it uses less digits than its factorization.

11711280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6994 (or 6988 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 21.

The square root of 11711280 is about 3422.1747471454. The cubic root of 11711280 is about 227.0918011226.

Adding to 11711280 its reverse (8211711), we get a palindrome (19922991).

The spelling of 11711280 in words is "eleven million, seven hundred eleven thousand, two hundred eighty".