28275781920 has 48 divisors (see below), whose sum is σ = 89068714560. Its totient is φ = 7540208384.

The previous prime is 28275781909. The next prime is 28275781993. The reversal of 28275781920 is 2918757282.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29453460 + ... + 29454419.

It is an arithmetic number, because the mean of its divisors is an integer number (1855598220).

Almost surely, 2^28275781920 is an apocalyptic number.

28275781920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28275781920 is an abundant number, since it is smaller than the sum of its proper divisors (60792932640).

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

28275781920 is a wasteful number, since it uses less digits than its factorization.

28275781920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58907897 (or 58907889 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 51.

The spelling of 28275781920 in words is "twenty-eight billion, two hundred seventy-five million, seven hundred eighty-one thousand, nine hundred twenty".