11281320 has 48 divisors (see below), whose sum is σ = 36665460. Its totient is φ = 3008256.

The previous prime is 11281313. The next prime is 11281321. The reversal of 11281320 is 2318211.

It can be written as a sum of positive squares in 2 ways, for example, as 10771524 + 509796 = 3282^2 + 714^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 11281293 and 11281302.

It is not an unprimeable number, because it can be changed into a prime (11281321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15309 + ... + 16028.

Almost surely, 2^11281320 is an apocalyptic number.

11281320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11281320 is an abundant number, since it is smaller than the sum of its proper divisors (25384140).

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

11281320 is a wasteful number, since it uses less digits than its factorization.

11281320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31354 (or 31347 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 11281320 is about 3358.7676311409. The cubic root of 11281320 is about 224.2779818403.

Adding to 11281320 its reverse (2318211), we get a palindrome (13599531).

The spelling of 11281320 in words is "eleven million, two hundred eighty-one thousand, three hundred twenty".