28108343057920 has 40 divisors (see below), whose sum is σ = 67394144416104. Its totient is φ = 11243337222144.

The previous prime is 28108343057881. The next prime is 28108343057941. The reversal of 28108343057920 is 2975034380182.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5489908194 + ... + 5489913313.

Almost surely, 2^{28108343057920} is an apocalyptic number.

28108343057920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28108343057920 is an abundant number, since it is smaller than the sum of its proper divisors (39285801358184).

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

28108343057920 is an equidigital number, since it uses as much as digits as its factorization.

28108343057920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10979821530 (or 10979821514 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 28108343057920 in words is "twenty-eight trillion, one hundred eight billion, three hundred forty-three million, fifty-seven thousand, nine hundred twenty".