28505750 has 96 divisors (see below), whose sum is σ = 67223520. Its totient is φ = 8971200.

The previous prime is 28505749. The next prime is 28505759. The reversal of 28505750 is 5750582.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28505759) 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, 159161 + ... + 159339.

It is an arithmetic number, because the mean of its divisors is an integer number (700245).

Almost surely, 2^28505750 is an apocalyptic number.

28505750 is an abundant number, since it is smaller than the sum of its proper divisors (38717770).

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

28505750 is a wasteful number, since it uses less digits than its factorization.

28505750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 32.

The square root of 28505750 is about 5339.0776356970. The cubic root of 28505750 is about 305.4762781780.

The spelling of 28505750 in words is "twenty-eight million, five hundred five thousand, seven hundred fifty".