11565640 has 16 divisors (see below), whose sum is σ = 26022780. Its totient is φ = 4626240.

The previous prime is 11565637. The next prime is 11565647. The reversal of 11565640 is 4656511.

It can be written as a sum of positive squares in 2 ways, for example, as 11009124 + 556516 = 3318^2 + 746^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11565599 and 11565608.

It is not an unprimeable number, because it can be changed into a prime (11565647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144531 + ... + 144610.

Almost surely, 2^11565640 is an apocalyptic number.

11565640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11565640 is an abundant number, since it is smaller than the sum of its proper divisors (14457140).

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

11565640 is a wasteful number, since it uses less digits than its factorization.

11565640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289152 (or 289148 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 11565640 is about 3400.8293106241. The cubic root of 11565640 is about 226.1465100599.

The spelling of 11565640 in words is "eleven million, five hundred sixty-five thousand, six hundred forty".