64044240 has 120 divisors (see below), whose sum is σ = 215120160. Its totient is φ = 15754752.

The previous prime is 64044229. The next prime is 64044241. The reversal of 64044240 is 4244046.

64044240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 64044240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64044241) 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 23 ways as a sum of consecutive naturals, for example, 39771 + ... + 41349.

It is an arithmetic number, because the mean of its divisors is an integer number (1792668).

Almost surely, 2^64044240 is an apocalyptic number.

64044240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64044240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107560080).

64044240 is an abundant number, since it is smaller than the sum of its proper divisors (151075920).

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

64044240 is a wasteful number, since it uses less digits than its factorization.

64044240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621 (or 1602 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 64044240 is about 8002.7645223385. The cubic root of 64044240 is about 400.0921454381.

Adding to 64044240 its reverse (4244046), we get a palindrome (68288286).

The spelling of 64044240 in words is "sixty-four million, forty-four thousand, two hundred forty".