28558236 has 48 divisors (see below), whose sum is σ = 76783616. Its totient is φ = 8092224.

The previous prime is 28558219. The next prime is 28558237. The reversal of 28558236 is 63285582.

It is a junction number, because it is equal to n+sod(n) for n = 28558194 and 28558203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28558237) 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, 9330 + ... + 12006.

Almost surely, 2^28558236 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 28558236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38391808).

28558236 is an abundant number, since it is smaller than the sum of its proper divisors (48225380).

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

28558236 is a wasteful number, since it uses less digits than its factorization.

28558236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2818 (or 2816 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

The square root of 28558236 is about 5343.9906437044. The cubic root of 28558236 is about 305.6636485347.

The spelling of 28558236 in words is "twenty-eight million, five hundred fifty-eight thousand, two hundred thirty-six".