28560987990 has 112 divisors (see below), whose sum is σ = 77200776000. Its totient is φ = 7604274816.

The previous prime is 28560987971. The next prime is 28560987991. The reversal of 28560987990 is 9978906582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28560987991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 5238786 + ... + 5244234.

Almost surely, 2^28560987990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28560987990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38600388000).

28560987990 is an abundant number, since it is smaller than the sum of its proper divisors (48639788010).

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

28560987990 is an equidigital number, since it uses as much as digits as its factorization.

28560987990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6193 (or 6178 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

The spelling of 28560987990 in words is "twenty-eight billion, five hundred sixty million, nine hundred eighty-seven thousand, nine hundred ninety".