11649564 has 18 divisors (see below), whose sum is σ = 29447600. Its totient is φ = 3883176.

The previous prime is 11649563. The next prime is 11649587. The reversal of 11649564 is 46594611.

11649564 is a `hidden beast` number, since 1 + 1 + 649 + 5 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 323599 = 11649564 / (1 + 1 + 6 + 4 + 9 + 5 + 6 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11649563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 161764 + ... + 161835.

Almost surely, 2^11649564 is an apocalyptic number.

It is an amenable number.

11649564 is an abundant number, since it is smaller than the sum of its proper divisors (17798036).

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

11649564 is a wasteful number, since it uses less digits than its factorization.

11649564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323609 (or 323604 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 11649564 is about 3413.1457630755. The cubic root of 11649564 is about 226.6921895520.

The spelling of 11649564 in words is "eleven million, six hundred forty-nine thousand, five hundred sixty-four".