28540500 has 96 divisors (see below), whose sum is σ = 84913920. Its totient is φ = 7446400.

The previous prime is 28540441. The next prime is 28540507. The reversal of 28540500 is 504582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28540507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79321 + ... + 79679.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^28540500 is an apocalyptic number.

28540500 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 28540500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42456960).

28540500 is an abundant number, since it is smaller than the sum of its proper divisors (56373420).

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

28540500 is a wasteful number, since it uses less digits than its factorization.

28540500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 28540500 is about 5342.3309519347. The cubic root of 28540500 is about 305.6003582911.

The spelling of 28540500 in words is "twenty-eight million, five hundred forty thousand, five hundred".