28289635378280 has 64 divisors (see below), whose sum is σ = 64216989723600. Its totient is φ = 11215360880640.

The previous prime is 28289635378259. The next prime is 28289635378307. The reversal of 28289635378280 is 8287353698282.

It can be written as a sum of positive squares in 8 ways, for example, as 16472087850724 + 11817547527556 = 4058582^2 + 3437666^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179948510 + ... + 180105650.

Almost surely, 2^{28289635378280} is an apocalyptic number.

28289635378280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28289635378280 is an abundant number, since it is smaller than the sum of its proper divisors (35927354345320).

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

28289635378280 is a wasteful number, since it uses less digits than its factorization.

28289635378280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197094 (or 197090 counting only the distinct ones).

The product of its (nonzero) digits is 557383680, while the sum is 71.

The spelling of 28289635378280 in words is "twenty-eight trillion, two hundred eighty-nine billion, six hundred thirty-five million, three hundred seventy-eight thousand, two hundred eighty".