28138176 has 84 divisors (see below), whose sum is σ = 88004904. Its totient is φ = 8524800.

The previous prime is 28138171. The next prime is 28138189. The reversal of 28138176 is 67183182.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28138176.

It is not an unprimeable number, because it can be changed into a prime (28138171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4116 + ... + 8556.

Almost surely, 2^28138176 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28138176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44002452).

28138176 is an abundant number, since it is smaller than the sum of its proper divisors (59866728).

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

28138176 is a wasteful number, since it uses less digits than its factorization.

28138176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4470 (or 4457 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 28138176 is about 5304.5429586346. The cubic root of 28138176 is about 304.1575821978.

The spelling of 28138176 in words is "twenty-eight million, one hundred thirty-eight thousand, one hundred seventy-six".