28878326388 has 60 divisors (see below), whose sum is σ = 75515724900. Its totient is φ = 9623294208.

The previous prime is 28878326387. The next prime is 28878326417. The reversal of 28878326388 is 88362387882.

It can be written as a sum of positive squares in 2 ways, for example, as 13412419344 + 15465907044 = 115812^2 + 124362^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28878326387) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1300870 + ... + 1322882.

It is an arithmetic number, because the mean of its divisors is an integer number (1258595415).

Almost surely, 2^28878326388 is an apocalyptic number.

It is an amenable number.

28878326388 is an abundant number, since it is smaller than the sum of its proper divisors (46637398512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28878326388 is a wasteful number, since it uses less digits than its factorization.

28878326388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26078 (or 26067 counting only the distinct ones).

The product of its digits is 49545216, while the sum is 63.

The spelling of 28878326388 in words is "twenty-eight billion, eight hundred seventy-eight million, three hundred twenty-six thousand, three hundred eighty-eight".