28520368342281 has 32 divisors (see below), whose sum is σ = 42654457440000. Its totient is φ = 18833362867584.

The previous prime is 28520368342267. The next prime is 28520368342283. The reversal of 28520368342281 is 18224386302582.

28520368342281 is a `hidden beast` number, since 2 + 8 + 5 + 20 + 368 + 34 + 228 + 1 = 666.

It is not a de Polignac number, because 28520368342281 - 2²⁷ = 28520234124553 is a prime.

It is a super-2 number, since 2×28520368342281² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28520368342283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8429460 + ... + 11317973.

It is an arithmetic number, because the mean of its divisors is an integer number (1332951795000).

Almost surely, 2^{28520368342281} is an apocalyptic number.

It is an amenable number.

28520368342281 is a deficient number, since it is larger than the sum of its proper divisors (14134089097719).

28520368342281 is a wasteful number, since it uses less digits than its factorization.

28520368342281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19747950 (or 19747944 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 54.

The spelling of 28520368342281 in words is "twenty-eight trillion, five hundred twenty billion, three hundred sixty-eight million, three hundred forty-two thousand, two hundred eighty-one".