28188857816 has 16 divisors (see below), whose sum is σ = 60404695440. Its totient is φ = 12080939040.

The previous prime is 28188857779. The next prime is 28188857831. The reversal of 28188857816 is 61875888182.

It is a super-2 number, since 2×28188857816² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251686175 + ... + 251686286.

It is an arithmetic number, because the mean of its divisors is an integer number (3775293465).

Almost surely, 2^28188857816 is an apocalyptic number.

It is an amenable number.

28188857816 is an abundant number, since it is smaller than the sum of its proper divisors (32215837624).

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

28188857816 is a wasteful number, since it uses less digits than its factorization.

28188857816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503372474 (or 503372470 counting only the distinct ones).

The product of its digits is 13762560, while the sum is 62.

The spelling of 28188857816 in words is "twenty-eight billion, one hundred eighty-eight million, eight hundred fifty-seven thousand, eight hundred sixteen".