28840749355081 has 4 divisors (see below), whose sum is σ = 28985677744000. Its totient is φ = 28695820966164.

The previous prime is 28840749355069. The next prime is 28840749355189. The reversal of 28840749355081 is 18055394704882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28840749355081 - 2⁹ = 28840749354569 is a prime.

It is a super-2 number, since 2×28840749355081² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28840749355051) 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, 72464194161 + ... + 72464194558.

It is an arithmetic number, because the mean of its divisors is an integer number (7246419436000).

Almost surely, 2^{28840749355081} is an apocalyptic number.

It is an amenable number.

28840749355081 is a deficient number, since it is larger than the sum of its proper divisors (144928388919).

28840749355081 is a wasteful number, since it uses less digits than its factorization.

28840749355081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144928388918.

The product of its (nonzero) digits is 77414400, while the sum is 64.

The spelling of 28840749355081 in words is "twenty-eight trillion, eight hundred forty billion, seven hundred forty-nine million, three hundred fifty-five thousand, eighty-one".