28132215568 has 20 divisors (see below), whose sum is σ = 55252829788. Its totient is φ = 13873420800.

The previous prime is 28132215557. The next prime is 28132215569. The reversal of 28132215568 is 86551223182.

It can be written as a sum of positive squares in 2 ways, for example, as 8451492624 + 19680722944 = 91932^2 + 140288^2 .

It is not an unprimeable number, because it can be changed into a prime (28132215569) 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, 12041733 + ... + 12044068.

Almost surely, 2^28132215568 is an apocalyptic number.

It is an amenable number.

28132215568 is a deficient number, since it is larger than the sum of its proper divisors (27120614220).

28132215568 is a wasteful number, since it uses less digits than its factorization.

28132215568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24085882 (or 24085876 counting only the distinct ones).

The product of its digits is 230400, while the sum is 43.

The spelling of 28132215568 in words is "twenty-eight billion, one hundred thirty-two million, two hundred fifteen thousand, five hundred sixty-eight".