28871661573 has 32 divisors (see below), whose sum is σ = 44272800000. Its totient is φ = 18573541056.

The previous prime is 28871661571. The next prime is 28871661619. The reversal of 28871661573 is 37516617882.

It is a happy number.

28871661573 is a `hidden beast` number, since 2 + 8 + 8 + 7 + 1 + 6 + 61 + 573 = 666.

It is not a de Polignac number, because 28871661573 - 2¹ = 28871661571 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28871661571) 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, 1516608 + ... + 1535526.

It is an arithmetic number, because the mean of its divisors is an integer number (1383525000).

Almost surely, 2^28871661573 is an apocalyptic number.

It is an amenable number.

28871661573 is a deficient number, since it is larger than the sum of its proper divisors (15401138427).

28871661573 is a wasteful number, since it uses less digits than its factorization.

28871661573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20906 (or 20900 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 28871661573 in words is "twenty-eight billion, eight hundred seventy-one million, six hundred sixty-one thousand, five hundred seventy-three".