28517500 has 120 divisors (see below), whose sum is σ = 73214064. Its totient is φ = 9600000.

The previous prime is 28517479. The next prime is 28517519. The reversal of 28517500 is 571582.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 467470 + ... + 467530.

Almost surely, 2^28517500 is an apocalyptic number.

28517500 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 28517500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36607032).

28517500 is an abundant number, since it is smaller than the sum of its proper divisors (44696564).

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

28517500 is a wasteful number, since it uses less digits than its factorization.

28517500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 28517500 is about 5340.1778996584. The cubic root of 28517500 is about 305.5182446024.

The spelling of 28517500 in words is "twenty-eight million, five hundred seventeen thousand, five hundred".