28888634920 has 32 divisors (see below), whose sum is σ = 66101119200. Its totient is φ = 11359597888.

The previous prime is 28888634897. The next prime is 28888634923. The reversal of 28888634920 is 2943688882.

It is not an unprimeable number, because it can be changed into a prime (28888634923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6118114 + ... + 6122833.

It is an arithmetic number, because the mean of its divisors is an integer number (2065659975).

Almost surely, 2^28888634920 is an apocalyptic number.

28888634920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28888634920 is an abundant number, since it is smaller than the sum of its proper divisors (37212484280).

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

28888634920 is a wasteful number, since it uses less digits than its factorization.

28888634920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12241017 (or 12241013 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 58.

The spelling of 28888634920 in words is "twenty-eight billion, eight hundred eighty-eight million, six hundred thirty-four thousand, nine hundred twenty".