1440640128 has 64 divisors (see below), whose sum is σ = 3831242400. Its totient is φ = 479643648.

The previous prime is 1440640109. The next prime is 1440640171. The reversal of 1440640128 is 8210460441.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 1440640095 and 1440640104.

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, 431875 + ... + 435197.

Almost surely, 2^1440640128 is an apocalyptic number.

It is an amenable number.

1440640128 is an abundant number, since it is smaller than the sum of its proper divisors (2390602272).

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

1440640128 is a wasteful number, since it uses less digits than its factorization.

1440640128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4469 (or 4457 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 1440640128 is about 37955.7654118581. The cubic root of 1440640128 is about 1129.4105386220.

The spelling of 1440640128 in words is "one billion, four hundred forty million, six hundred forty thousand, one hundred twenty-eight".