28850987640 has 128 divisors (see below), whose sum is σ = 92485800000. Its totient is φ = 7174545408.

The previous prime is 28850987609. The next prime is 28850987723. The reversal of 28850987640 is 4678905882.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 157486 + ... + 287234.

Almost surely, 2^28850987640 is an apocalyptic number.

28850987640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28850987640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46242900000).

28850987640 is an abundant number, since it is smaller than the sum of its proper divisors (63634812360).

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

28850987640 is a wasteful number, since it uses less digits than its factorization.

28850987640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129889 (or 129885 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 28850987640 in words is "twenty-eight billion, eight hundred fifty million, nine hundred eighty-seven thousand, six hundred forty".