28750590 has 96 divisors (see below), whose sum is σ = 82588896. Its totient is φ = 6881280.

The previous prime is 28750573. The next prime is 28750597. The reversal of 28750590 is 9505782.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28750597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 111742 + ... + 111998.

It is an arithmetic number, because the mean of its divisors is an integer number (860301).

Almost surely, 2^28750590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28750590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41294448).

28750590 is an abundant number, since it is smaller than the sum of its proper divisors (53838306).

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

28750590 is a wasteful number, since it uses less digits than its factorization.

28750590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 28750590 is about 5361.9576648832. The cubic root of 28750590 is about 306.3483793333.

The spelling of 28750590 in words is "twenty-eight million, seven hundred fifty thousand, five hundred ninety".