28981750 has 32 divisors (see below), whose sum is σ = 62008128. Its totient is φ = 9936000.

The previous prime is 28981741. The next prime is 28981769. The reversal of 28981750 is 5718982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6531 + ... + 10030.

It is an arithmetic number, because the mean of its divisors is an integer number (1937754).

Almost surely, 2^28981750 is an apocalyptic number.

28981750 is an abundant number, since it is smaller than the sum of its proper divisors (33026378).

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

28981750 is a wasteful number, since it uses less digits than its factorization.

28981750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16585 (or 16575 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28981750 is about 5383.4700705029. The cubic root of 28981750 is about 307.1672210192.

The spelling of 28981750 in words is "twenty-eight million, nine hundred eighty-one thousand, seven hundred fifty".