8639028 has 48 divisors (see below), whose sum is σ = 22955520. Its totient is φ = 2808000.

The previous prime is 8639027. The next prime is 8639051. The reversal of 8639028 is 8209368.

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 = 8638983 and 8639001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8639027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3453 + ... + 5403.

It is an arithmetic number, because the mean of its divisors is an integer number (478240).

Almost surely, 2^8639028 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 8639028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11477760).

8639028 is an abundant number, since it is smaller than the sum of its proper divisors (14316492).

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

8639028 is a wasteful number, since it uses less digits than its factorization.

8639028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005 (or 1997 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 8639028 is about 2939.2223461317. Note that the first 3 decimals coincide. The cubic root of 8639028 is about 205.1894184209.

The spelling of 8639028 in words is "eight million, six hundred thirty-nine thousand, twenty-eight".