11640545 has 16 divisors (see below), whose sum is σ = 16124160. Its totient is φ = 7902144.

The previous prime is 11640539. The next prime is 11640547. The reversal of 11640545 is 54504611.

11640545 = 123² + 124² + ... + 332².

It is a cyclic number.

It is not a de Polignac number, because 11640545 - 2⁶ = 11640481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11640547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1991 + ... + 5219.

It is an arithmetic number, because the mean of its divisors is an integer number (1007760).

Almost surely, 2^11640545 is an apocalyptic number.

It is an amenable number.

11640545 is a deficient number, since it is larger than the sum of its proper divisors (4483615).

11640545 is a wasteful number, since it uses less digits than its factorization.

11640545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 11640545 is about 3411.8242920760. The cubic root of 11640545 is about 226.6336733504.

The spelling of 11640545 in words is "eleven million, six hundred forty thousand, five hundred forty-five".