28136628 has 72 divisors (see below), whose sum is σ = 77968800. Its totient is φ = 8502336.

The previous prime is 28136611. The next prime is 28136651. The reversal of 28136628 is 82663182.

28136628 is a `hidden beast` number, since 28 + 1 + 3 + 6 + 628 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 28136592 and 28136601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27103 + ... + 28121.

It is an arithmetic number, because the mean of its divisors is an integer number (1082900).

Almost surely, 2^28136628 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 28136628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38984400).

28136628 is an abundant number, since it is smaller than the sum of its proper divisors (49832172).

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

28136628 is a wasteful number, since it uses less digits than its factorization.

28136628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101 (or 1096 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 28136628 is about 5304.3970439627. The cubic root of 28136628 is about 304.1520044307.

The spelling of 28136628 in words is "twenty-eight million, one hundred thirty-six thousand, six hundred twenty-eight".