11287540 has 24 divisors (see below), whose sum is σ = 25859232. Its totient is φ = 4104480.

The previous prime is 11287531. The next prime is 11287559. The reversal of 11287540 is 4578211.

It is a junction number, because it is equal to n+sod(n) for n = 11287499 and 11287508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25434 + ... + 25873.

It is an arithmetic number, because the mean of its divisors is an integer number (1077468).

Almost surely, 2^11287540 is an apocalyptic number.

11287540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11287540 is an abundant number, since it is smaller than the sum of its proper divisors (14571692).

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

11287540 is a wasteful number, since it uses less digits than its factorization.

11287540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51327 (or 51325 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 11287540 is about 3359.6934383958. The cubic root of 11287540 is about 224.3191931153.

It can be divided in two parts, 1128 and 7540, that added together give a palindrome (8668).

The spelling of 11287540 in words is "eleven million, two hundred eighty-seven thousand, five hundred forty".