28538188 has 18 divisors (see below), whose sum is σ = 58095996. Its totient is φ = 12230568.

The previous prime is 28538183. The next prime is 28538227. The reversal of 28538188 is 88183582.

It is not an unprimeable number, because it can be changed into a prime (28538183) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72606 + ... + 72997.

Almost surely, 2^28538188 is an apocalyptic number.

28538188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28538188 is an abundant number, since it is smaller than the sum of its proper divisors (29557808).

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

28538188 is a wasteful number, since it uses less digits than its factorization.

28538188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145621 (or 145612 counting only the distinct ones).

The product of its digits is 122880, while the sum is 43.

The square root of 28538188 is about 5342.1145626053. The cubic root of 28538188 is about 305.5921060752.

The spelling of 28538188 in words is "twenty-eight million, five hundred thirty-eight thousand, one hundred eighty-eight".