28788881900 has 18 divisors (see below), whose sum is σ = 62471873940. Its totient is φ = 11515552720.

The previous prime is 28788881851. The next prime is 28788881939. The reversal of 28788881900 is 918888782.

It is a super-2 number, since 2×28788881900² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28788881900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143944310 + ... + 143944509.

Almost surely, 2^28788881900 is an apocalyptic number.

28788881900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28788881900 is an abundant number, since it is smaller than the sum of its proper divisors (33682992040).

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

28788881900 is a wasteful number, since it uses less digits than its factorization.

28788881900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287888833 (or 287888826 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 59.

The spelling of 28788881900 in words is "twenty-eight billion, seven hundred eighty-eight million, eight hundred eighty-one thousand, nine hundred".