65544 has 16 divisors (see below), whose sum is σ = 163920. Its totient is φ = 21840.

The previous prime is 65543. The next prime is 65551. The reversal of 65544 is 44556.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 2731 = 65544 / (6 + 5 + 5 + 4 + 4).

It is an Ulam number.

It is a plaindrome in base 13.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (65543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (2) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1342 + ... + 1389.

It is an arithmetic number, because the mean of its divisors is an integer number (10245).

2⁶⁵⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

65544 is an abundant number, since it is smaller than the sum of its proper divisors (98376).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81960).

65544 is a wasteful number, since it uses less digits than its factorization.

65544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740 (or 2736 counting only the distinct ones).

The product of its digits is 2400, while the sum is 24.

The square root of 65544 is about 256.0156245232. The cubic root of 65544 is about 40.3191140521.

The spelling of 65544 in words is "sixty-five thousand, five hundred forty-four".