28055011881897 has 192 divisors, whose sum is σ = 56176426156032. Its totient is φ = 13016308608000.

The previous prime is 28055011881893. The next prime is 28055011881917. The reversal of 28055011881897 is 79818811055082.

28055011881897 is a `hidden beast` number, since 28 + 0 + 5 + 501 + 1 + 8 + 8 + 18 + 97 = 666.

It is not a de Polignac number, because 28055011881897 - 2² = 28055011881893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (28055011881893) by changing a digit.

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 191 ways as a sum of consecutive naturals, for example, 2184793197 + ... + 2184806037.

It is an arithmetic number, because the mean of its divisors is an integer number (292585552896).

Almost surely, 2^{28055011881897} is an apocalyptic number.

It is an amenable number.

28055011881897 is an abundant number, since it is smaller than the sum of its proper divisors (28121414274135).

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

28055011881897 is a wasteful number, since it uses less digits than its factorization.

28055011881897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20732 (or 20729 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 63.

The spelling of 28055011881897 in words is "twenty-eight trillion, fifty-five billion, eleven million, eight hundred eighty-one thousand, eight hundred ninety-seven".