28859555107881 has 21 divisors (see below), whose sum is σ = 43269756200301. Its totient is φ = 19239606707292.

The previous prime is 28859555107843. The next prime is 28859555107897. The reversal of 28859555107881 is 18870155595882.

The square root of 28859555107881 is 5372109.

It is a perfect power (a square), and thus also a powerful number.

28859555107881 is a `hidden beast` number, since 2 + 8 + 8 + 59 + 55 + 510 + 7 + 8 + 8 + 1 = 666.

It is not a de Polignac number, because 28859555107881 - 2¹⁹ = 28859554583593 is a prime.

It is a super-2 number, since 2×28859555107881² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28859555107181) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 144947460 + ... + 145146426.

Almost surely, 2^{28859555107881} is an apocalyptic number.

28859555107881 is the 5372109-th square number.

28859555107881 is the 2686055-th centered octagonal number.

It is an amenable number.

28859555107881 is a deficient number, since it is larger than the sum of its proper divisors (14410201092420).

28859555107881 is an frugal number, since it uses more digits than its factorization.

28859555107881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397952 (or 198970 counting only the distinct ones).

The product of its (nonzero) digits is 322560000, while the sum is 72.

The spelling of 28859555107881 in words is "twenty-eight trillion, eight hundred fifty-nine billion, five hundred fifty-five million, one hundred seven thousand, eight hundred eighty-one".