1728888813 has 32 divisors (see below), whose sum is σ = 2613427200. Its totient is φ = 1129379328.

The previous prime is 1728888809. The next prime is 1728888871. The reversal of 1728888813 is 3188888271.

It is not a de Polignac number, because 1728888813 - 2² = 1728888809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1728888813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728888883) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 268356 + ... + 274722.

It is an arithmetic number, because the mean of its divisors is an integer number (81669600).

Almost surely, 2^1728888813 is an apocalyptic number.

It is an amenable number.

1728888813 is a deficient number, since it is larger than the sum of its proper divisors (884538387).

1728888813 is a wasteful number, since it uses less digits than its factorization.

1728888813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6578 (or 6572 counting only the distinct ones).

The product of its digits is 1376256, while the sum is 54.

The square root of 1728888813 is about 41579.9087661337. The cubic root of 1728888813 is about 1200.2057084847.

The spelling of 1728888813 in words is "one billion, seven hundred twenty-eight million, eight hundred eighty-eight thousand, eight hundred thirteen".