28871178388 has 18 divisors (see below), whose sum is σ = 54413376234. Its totient is φ = 13324593744.

The previous prime is 28871178383. The next prime is 28871178419. The reversal of 28871178388 is 88387117882.

It can be written as a sum of positive squares in only one way, i.e., 19987738884 + 8883439504 = 141378^2 + 94252^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28871178383) 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, 1213495 + ... + 1237057.

Almost surely, 2^28871178388 is an apocalyptic number.

It is an amenable number.

28871178388 is a deficient number, since it is larger than the sum of its proper divisors (25542197846).

28871178388 is an frugal number, since it uses more digits than its factorization.

28871178388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47143 (or 23578 counting only the distinct ones).

The product of its digits is 9633792, while the sum is 61.

The spelling of 28871178388 in words is "twenty-eight billion, eight hundred seventy-one million, one hundred seventy-eight thousand, three hundred eighty-eight".