28785381100 has 36 divisors (see below), whose sum is σ = 71387746864. Its totient is φ = 9869273280.

The previous prime is 28785381089. The next prime is 28785381109. The reversal of 28785381100 is 118358782.

It is not an unprimeable number, because it can be changed into a prime (28785381109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20560287 + ... + 20561686.

Almost surely, 2^28785381100 is an apocalyptic number.

28785381100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28785381100 is an abundant number, since it is smaller than the sum of its proper divisors (42602365764).

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

28785381100 is a wasteful number, since it uses less digits than its factorization.

28785381100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41121994 (or 41121987 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 43.

The spelling of 28785381100 in words is "twenty-eight billion, seven hundred eighty-five million, three hundred eighty-one thousand, one hundred".