28287334280 has 128 divisors (see below), whose sum is σ = 69864444000. Its totient is φ = 10259988480.

The previous prime is 28287334253. The next prime is 28287334301. The reversal of 28287334280 is 8243378282.

It can be written as a sum of positive squares in 16 ways, for example, as 183494116 + 28103840164 = 13546^2 + 167642^2 .

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 31 ways as a sum of consecutive naturals, for example, 11219420 + ... + 11221940.

Almost surely, 2^28287334280 is an apocalyptic number.

28287334280 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 28287334280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34932222000).

28287334280 is an abundant number, since it is smaller than the sum of its proper divisors (41577109720).

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

28287334280 is a wasteful number, since it uses less digits than its factorization.

28287334280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3147 (or 3143 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 47.

The spelling of 28287334280 in words is "twenty-eight billion, two hundred eighty-seven million, three hundred thirty-four thousand, two hundred eighty".