28216882728 has 48 divisors (see below), whose sum is σ = 77673534900. Its totient is φ = 9251435520.

The previous prime is 28216882717. The next prime is 28216882739. The reversal of 28216882728 is 82728861282.

28216882728 is a `hidden beast` number, since 282 + 16 + 88 + 272 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (28216882717) and next prime (28216882739).

It can be written as a sum of positive squares in 2 ways, for example, as 18431320644 + 9785562084 = 135762^2 + 98922^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3207913 + ... + 3216696.

Almost surely, 2^28216882728 is an apocalyptic number.

It is an amenable number.

28216882728 is an abundant number, since it is smaller than the sum of its proper divisors (49456652172).

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

28216882728 is a wasteful number, since it uses less digits than its factorization.

28216882728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6424682 (or 6424675 counting only the distinct ones).

The product of its digits is 2752512, while the sum is 54.

The spelling of 28216882728 in words is "twenty-eight billion, two hundred sixteen million, eight hundred eighty-two thousand, seven hundred twenty-eight".