28538158508 has 12 divisors (see below), whose sum is σ = 50015989800. Its totient is φ = 14247875712.

The previous prime is 28538158507. The next prime is 28538158541. The reversal of 28538158508 is 80585183582.

It is a self number, because there is not a number n which added to its sum of digits gives 28538158508.

It is not an unprimeable number, because it can be changed into a prime (28538158507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5297858 + ... + 5303241.

It is an arithmetic number, because the mean of its divisors is an integer number (4167999150).

Almost surely, 2^28538158508 is an apocalyptic number.

It is an amenable number.

28538158508 is a deficient number, since it is larger than the sum of its proper divisors (21477831292).

28538158508 is a wasteful number, since it uses less digits than its factorization.

28538158508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10601776 (or 10601774 counting only the distinct ones).

The product of its (nonzero) digits is 3072000, while the sum is 53.

The spelling of 28538158508 in words is "twenty-eight billion, five hundred thirty-eight million, one hundred fifty-eight thousand, five hundred eight".