28308454483820 has 48 divisors (see below), whose sum is σ = 67983870689280. Its totient is φ = 9699530119104.

The previous prime is 28308454483819. The next prime is 28308454483847. The reversal of 28308454483820 is 2838445480382.

It is a self number, because there is not a number n which added to its sum of digits gives 28308454483820.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64632044 + ... + 65068563.

It is an arithmetic number, because the mean of its divisors is an integer number (1416330639360).

Almost surely, 2^{28308454483820} is an apocalyptic number.

28308454483820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28308454483820 is an abundant number, since it is smaller than the sum of its proper divisors (39675416205460).

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

28308454483820 is a wasteful number, since it uses less digits than its factorization.

28308454483820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129702182 (or 129702180 counting only the distinct ones).

The product of its (nonzero) digits is 47185920, while the sum is 59.

Subtracting from 28308454483820 its sum of digits (59), we obtain a square (28308454483761 = 5320569²).

The spelling of 28308454483820 in words is "twenty-eight trillion, three hundred eight billion, four hundred fifty-four million, four hundred eighty-three thousand, eight hundred twenty".