28273188100 has 18 divisors (see below), whose sum is σ = 61352818394. Its totient is φ = 11309275200.

The previous prime is 28273187953. The next prime is 28273188149. The reversal of 28273188100 is 188137282.

It can be written as a sum of positive squares in 3 ways, for example, as 562258944 + 27710929156 = 23712^2 + 166466^2 .

It is a super-2 number, since 2×28273188100² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 141365841 + ... + 141366040.

Almost surely, 2^28273188100 is an apocalyptic number.

28273188100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28273188100 is an abundant number, since it is smaller than the sum of its proper divisors (33079630294).

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

28273188100 is a wasteful number, since it uses less digits than its factorization.

28273188100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282731895 (or 282731888 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The spelling of 28273188100 in words is "twenty-eight billion, two hundred seventy-three million, one hundred eighty-eight thousand, one hundred".