28736991888 has 80 divisors (see below), whose sum is σ = 81162430272. Its totient is φ = 8689216000.

The previous prime is 28736991887. The next prime is 28736991893. The reversal of 28736991888 is 88819963782.

It is not an unprimeable number, because it can be changed into a prime (28736991887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184378 + ... + 302438.

Almost surely, 2^28736991888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28736991888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40581215136).

28736991888 is an abundant number, since it is smaller than the sum of its proper divisors (52425438384).

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

28736991888 is a wasteful number, since it uses less digits than its factorization.

28736991888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118544 (or 118538 counting only the distinct ones).

The product of its digits is 83607552, while the sum is 69.

The spelling of 28736991888 in words is "twenty-eight billion, seven hundred thirty-six million, nine hundred ninety-one thousand, eight hundred eighty-eight".