28120376336 has 80 divisors (see below), whose sum is σ = 60186199920. Its totient is φ = 12648130560.

The previous prime is 28120376309. The next prime is 28120376341. The reversal of 28120376336 is 63367302182.

It can be written as a sum of positive squares in 8 ways, for example, as 251412736 + 27868963600 = 15856^2 + 166940^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28120376293 and 28120376302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1372826 + ... + 1393158.

It is an arithmetic number, because the mean of its divisors is an integer number (752327499).

Almost surely, 2^28120376336 is an apocalyptic number.

28120376336 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28120376336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30093099960).

28120376336 is an abundant number, since it is smaller than the sum of its proper divisors (32065823584).

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

28120376336 is a wasteful number, since it uses less digits than its factorization.

28120376336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20524 (or 20518 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 41.

The spelling of 28120376336 in words is "twenty-eight billion, one hundred twenty million, three hundred seventy-six thousand, three hundred thirty-six".