1639168672 has 24 divisors (see below), whose sum is σ = 3314334996. Its totient is φ = 797432832.

The previous prime is 1639168667. The next prime is 1639168673. The reversal of 1639168672 is 2768619361.

It can be written as a sum of positive squares in 2 ways, for example, as 1599680016 + 39488656 = 39996^2 + 6284^2 .

It is not an unprimeable number, because it can be changed into a prime (1639168673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 691033 + ... + 693400.

Almost surely, 2^1639168672 is an apocalyptic number.

It is an amenable number.

1639168672 is an abundant number, since it is smaller than the sum of its proper divisors (1675166324).

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

1639168672 is a wasteful number, since it uses less digits than its factorization.

1639168672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384480 (or 1384472 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The square root of 1639168672 is about 40486.6480706912. The cubic root of 1639168672 is about 1179.0744134919.

The spelling of 1639168672 in words is "one billion, six hundred thirty-nine million, one hundred sixty-eight thousand, six hundred seventy-two".