28971851841 has 6 divisors (see below), whose sum is σ = 41848230450. Its totient is φ = 19314567888.

The previous prime is 28971851819. The next prime is 28971851849. The reversal of 28971851841 is 14815817982.

28971851841 is a `hidden beast` number, since 2 + 89 + 7 + 1 + 8 + 518 + 41 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20186726400 + 8785125441 = 142080^2 + 93729^2 .

It is not a de Polignac number, because 28971851841 - 2¹¹ = 28971849793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28971851849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1609547316 + ... + 1609547333.

It is an arithmetic number, because the mean of its divisors is an integer number (6974705075).

Almost surely, 2^28971851841 is an apocalyptic number.

It is an amenable number.

28971851841 is a deficient number, since it is larger than the sum of its proper divisors (12876378609).

28971851841 is a wasteful number, since it uses less digits than its factorization.

28971851841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3219094655 (or 3219094652 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 54.

The spelling of 28971851841 in words is "twenty-eight billion, nine hundred seventy-one million, eight hundred fifty-one thousand, eight hundred forty-one".