28817888221071 has 24 divisors (see below), whose sum is σ = 43457251328400. Its totient is φ = 19082986359552.

The previous prime is 28817888221063. The next prime is 28817888221091. The reversal of 28817888221071 is 17012288871882.

28817888221071 is a `hidden beast` number, since 288 + 1 + 78 + 8 + 8 + 2 + 210 + 71 = 666.

It is not a de Polignac number, because 28817888221071 - 2³ = 28817888221063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28817888221021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 397923970 + ... + 397996383.

It is an arithmetic number, because the mean of its divisors is an integer number (1810718805350).

Almost surely, 2^{28817888221071} is an apocalyptic number.

28817888221071 is a deficient number, since it is larger than the sum of its proper divisors (14639363107329).

28817888221071 is an equidigital number, since it uses as much as digits as its factorization.

28817888221071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795920517 (or 795920505 counting only the distinct ones).

The product of its (nonzero) digits is 12845056, while the sum is 63.

The spelling of 28817888221071 in words is "twenty-eight trillion, eight hundred seventeen billion, eight hundred eighty-eight million, two hundred twenty-one thousand, seventy-one".