64240 has 40 divisors (see below), whose sum is σ = 165168. Its totient is φ = 23040.

The previous prime is 64237. The next prime is 64271. The reversal of 64240 is 4246.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a zygodrome in base 4.

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, 844 + ... + 916.

2⁶⁴²⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82584).

64240 is an abundant number, since it is smaller than the sum of its proper divisors (100928).

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

64240 is a wasteful number, since it uses less digits than its factorization.

64240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 64240 is about 253.4561105991. The cubic root of 64240 is about 40.0499376299.

Adding to 64240 its reverse (4246), we get a palindrome (68486).

The spelling of 64240 in words is "sixty-four thousand, two hundred forty".