28217336678120 has 16 divisors (see below), whose sum is σ = 63489007525860. Its totient is φ = 11286934671232.

The previous prime is 28217336678099. The next prime is 28217336678129. The reversal of 28217336678120 is 2187663371282.

It can be written as a sum of positive squares in 2 ways, for example, as 28019850650884 + 197486027236 = 5293378^2 + 444394^2 .

It is not an unprimeable number, because it can be changed into a prime (28217336678129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352716708437 + ... + 352716708516.

Almost surely, 2^{28217336678120} is an apocalyptic number.

28217336678120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28217336678120 is an abundant number, since it is smaller than the sum of its proper divisors (35271670847740).

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

28217336678120 is a wasteful number, since it uses less digits than its factorization.

28217336678120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705433416964 (or 705433416960 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 56.

The spelling of 28217336678120 in words is "twenty-eight trillion, two hundred seventeen billion, three hundred thirty-six million, six hundred seventy-eight thousand, one hundred twenty".