28308500 has 48 divisors (see below), whose sum is σ = 67459392. Its totient is φ = 10292000.

The previous prime is 28308493. The next prime is 28308503. The reversal of 28308500 is 580382.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28308500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28308503) 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, 2927 + ... + 8073.

It is an arithmetic number, because the mean of its divisors is an integer number (1405404).

Almost surely, 2^28308500 is an apocalyptic number.

28308500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28308500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33729696).

28308500 is an abundant number, since it is smaller than the sum of its proper divisors (39150892).

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

28308500 is a wasteful number, since it uses less digits than its factorization.

28308500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5177 (or 5165 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 28308500 is about 5320.5732773828. The cubic root of 28308500 is about 304.7700497343.

Adding to 28308500 its reverse (580382), we get a palindrome (28888882).

The spelling of 28308500 in words is "twenty-eight million, three hundred eight thousand, five hundred".