28870514881 has 12 divisors (see below), whose sum is σ = 31548984060. Its totient is φ = 26405196480.

The previous prime is 28870514873. The next prime is 28870514887. The reversal of 28870514881 is 18841507882.

It can be written as a sum of positive squares in 6 ways, for example, as 66994225 + 28803520656 = 8185^2 + 169716^2 .

It is not a de Polignac number, because 28870514881 - 2³ = 28870514873 is a prime.

It is a super-2 number, since 2×28870514881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28870514887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 765210 + ... + 802051.

It is an arithmetic number, because the mean of its divisors is an integer number (2629082005).

Almost surely, 2^28870514881 is an apocalyptic number.

It is an amenable number.

28870514881 is a deficient number, since it is larger than the sum of its proper divisors (2678469179).

28870514881 is a wasteful number, since it uses less digits than its factorization.

28870514881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567396 (or 1567383 counting only the distinct ones).

The product of its (nonzero) digits is 1146880, while the sum is 52.

The spelling of 28870514881 in words is "twenty-eight billion, eight hundred seventy million, five hundred fourteen thousand, eight hundred eighty-one".