28658500 has 48 divisors (see below), whose sum is σ = 67420080. Its totient is φ = 10579200.

The previous prime is 28658491. The next prime is 28658503. The reversal of 28658500 is 585682.

It can be written as a sum of positive squares in 8 ways, for example, as 21678336 + 6980164 = 4656^2 + 2642^2 .

It is not an unprimeable number, because it can be changed into a prime (28658503) 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, 4296 + ... + 8704.

It is an arithmetic number, because the mean of its divisors is an integer number (1404585).

Almost surely, 2^28658500 is an apocalyptic number.

28658500 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 28658500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33710040).

28658500 is an abundant number, since it is smaller than the sum of its proper divisors (38761580).

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

28658500 is a wasteful number, since it uses less digits than its factorization.

28658500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441 (or 4429 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 28658500 is about 5353.3634287240. The cubic root of 28658500 is about 306.0209449260.

The spelling of 28658500 in words is "twenty-eight million, six hundred fifty-eight thousand, five hundred".