28125900 has 144 divisors (see below), whose sum is σ = 98743680. Its totient is φ = 6811200.

The previous prime is 28125899. The next prime is 28125931. The reversal of 28125900 is 952182.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 47 ways as a sum of consecutive naturals, for example, 29227 + ... + 30173.

It is an arithmetic number, because the mean of its divisors is an integer number (685720).

Almost surely, 2^28125900 is an apocalyptic number.

28125900 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 28125900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49371840).

28125900 is an abundant number, since it is smaller than the sum of its proper divisors (70617780).

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

28125900 is a wasteful number, since it uses less digits than its factorization.

28125900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981 (or 968 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 28125900 is about 5303.3857110340. The cubic root of 28125900 is about 304.1133435851.

The spelling of 28125900 in words is "twenty-eight million, one hundred twenty-five thousand, nine hundred".