28101500 has 144 divisors (see below), whose sum is σ = 75688704. Its totient is φ = 9072000.

The previous prime is 28101499. The next prime is 28101509. The reversal of 28101500 is 510182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28101509) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 759482 + ... + 759518.

It is an arithmetic number, because the mean of its divisors is an integer number (525616).

Almost surely, 2^28101500 is an apocalyptic number.

28101500 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 28101500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37844352).

28101500 is an abundant number, since it is smaller than the sum of its proper divisors (47587204).

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

28101500 is a wasteful number, since it uses less digits than its factorization.

28101500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 28101500 is about 5301.0847946435. The cubic root of 28101500 is about 304.0253758827.

Adding to 28101500 its reverse (510182), we get a palindrome (28611682).

The spelling of 28101500 in words is "twenty-eight million, one hundred one thousand, five hundred".