28686362240 has 32 divisors (see below), whose sum is σ = 68578336260. Its totient is φ = 11474544640.

The previous prime is 28686362239. The next prime is 28686362261. The reversal of 28686362240 is 4226368682.

It can be written as a sum of positive squares in 2 ways, for example, as 27420710464 + 1265651776 = 165592^2 + 35576^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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 3 ways as a sum of consecutive naturals, for example, 22410581 + ... + 22411860.

Almost surely, 2^28686362240 is an apocalyptic number.

28686362240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28686362240 is an abundant number, since it is smaller than the sum of its proper divisors (39891974020).

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

28686362240 is an equidigital number, since it uses as much as digits as its factorization.

28686362240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44822460 (or 44822448 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 47.

The spelling of 28686362240 in words is "twenty-eight billion, six hundred eighty-six million, three hundred sixty-two thousand, two hundred forty".