28279712180 has 54 divisors (see below), whose sum is σ = 61415546598. Its totient is φ = 10937960640.

The previous prime is 28279712171. The next prime is 28279712191. The reversal of 28279712180 is 8121797282.

It can be written as a sum of positive squares in 3 ways, for example, as 1872812176 + 26406900004 = 43276^2 + 162502^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23313254 + ... + 23314466.

It is an arithmetic number, because the mean of its divisors is an integer number (1137324937).

Almost surely, 2^28279712180 is an apocalyptic number.

28279712180 is a gapful number since it is divisible by the number (20) 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 28279712180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30707773299).

28279712180 is an abundant number, since it is smaller than the sum of its proper divisors (33135834418).

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

28279712180 is an equidigital number, since it uses as much as digits as its factorization.

28279712180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497 (or 1251 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 47.

The spelling of 28279712180 in words is "twenty-eight billion, two hundred seventy-nine million, seven hundred twelve thousand, one hundred eighty".