1440503664 has 80 divisors (see below), whose sum is σ = 3795185664. Its totient is φ = 470713600.

The previous prime is 1440503663. The next prime is 1440503693. The reversal of 1440503664 is 4663050441.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440503663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 649822 + ... + 652034.

Almost surely, 2^1440503664 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 1440503664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1897592832).

1440503664 is an abundant number, since it is smaller than the sum of its proper divisors (2354682000).

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

1440503664 is a wasteful number, since it uses less digits than its factorization.

1440503664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486 (or 2480 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 1440503664 is about 37953.9676977256. The cubic root of 1440503664 is about 1129.3748765245.

The spelling of 1440503664 in words is "one billion, four hundred forty million, five hundred three thousand, six hundred sixty-four".