1640544144 has 80 divisors (see below), whose sum is σ = 4284225792. Its totient is φ = 540929664.

The previous prime is 1640544133. The next prime is 1640544167. The reversal of 1640544144 is 4414450461.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2401627 + ... + 2402309.

Almost surely, 2^1640544144 is an apocalyptic number.

It is an amenable number.

1640544144 is an abundant number, since it is smaller than the sum of its proper divisors (2643681648).

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

1640544144 is a wasteful number, since it uses less digits than its factorization.

1640544144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164 (or 1158 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 1640544144 is about 40503.6312446181. The cubic root of 1640544144 is about 1179.4041193264.

The spelling of 1640544144 in words is "one billion, six hundred forty million, five hundred forty-four thousand, one hundred forty-four".