28169278240 has 24 divisors (see below), whose sum is σ = 66549920220. Its totient is φ = 11267711232.

The previous prime is 28169278237. The next prime is 28169278289. The reversal of 28169278240 is 4287296182.

It can be written as a sum of positive squares in 2 ways, for example, as 26661664656 + 1507613584 = 163284^2 + 38828^2 .

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 3 ways as a sum of consecutive naturals, for example, 88028835 + ... + 88029154.

Almost surely, 2^28169278240 is an apocalyptic number.

28169278240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28169278240 is an abundant number, since it is smaller than the sum of its proper divisors (38380641980).

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

28169278240 is a wasteful number, since it uses less digits than its factorization.

28169278240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176058004 (or 176057996 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 28169278240 in words is "twenty-eight billion, one hundred sixty-nine million, two hundred seventy-eight thousand, two hundred forty".