1440564644 has 12 divisors (see below), whose sum is σ = 2525518044. Its totient is φ = 718988064.

The previous prime is 1440564607. The next prime is 1440564661. The reversal of 1440564644 is 4464650441.

It can be written as a sum of positive squares in 2 ways, for example, as 860718244 + 579846400 = 29338^2 + 24080^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1440564598 and 1440564607.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321059 + ... + 325514.

It is an arithmetic number, because the mean of its divisors is an integer number (210459837).

Almost surely, 2^1440564644 is an apocalyptic number.

It is an amenable number.

1440564644 is a deficient number, since it is larger than the sum of its proper divisors (1084953400).

1440564644 is a wasteful number, since it uses less digits than its factorization.

1440564644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647134 (or 647132 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 38.

The square root of 1440564644 is about 37954.7710307940. The cubic root of 1440564644 is about 1129.3908126885.

The spelling of 1440564644 in words is "one billion, four hundred forty million, five hundred sixty-four thousand, six hundred forty-four".