28820057188 has 12 divisors (see below), whose sum is σ = 54314723260. Its totient is φ = 13301564832.

The previous prime is 28820057159. The next prime is 28820057207. The reversal of 28820057188 is 88175002882.

It can be written as a sum of positive squares in 2 ways, for example, as 9410552064 + 19409505124 = 97008^2 + 139318^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277115883 + ... + 277115986.

Almost surely, 2^28820057188 is an apocalyptic number.

It is an amenable number.

28820057188 is a deficient number, since it is larger than the sum of its proper divisors (25494666072).

28820057188 is a wasteful number, since it uses less digits than its factorization.

28820057188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554231886 (or 554231884 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 49.

The spelling of 28820057188 in words is "twenty-eight billion, eight hundred twenty million, fifty-seven thousand, one hundred eighty-eight".