28011125 has 16 divisors (see below), whose sum is σ = 36481536. Its totient is φ = 21432400.

The previous prime is 28011101. The next prime is 28011143. The reversal of 28011125 is 52111082.

It is a happy number.

It is not a de Polignac number, because 28011125 - 2⁸ = 28010869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28011097 and 28011106.

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, 1997 + ... + 7746.

It is an arithmetic number, because the mean of its divisors is an integer number (2280096).

Almost surely, 2^28011125 is an apocalyptic number.

28011125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28011125 is a deficient number, since it is larger than the sum of its proper divisors (8470411).

28011125 is an equidigital number, since it uses as much as digits as its factorization.

28011125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9781 (or 9771 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 28011125 is about 5292.5537314230. The cubic root of 28011125 is about 303.6991085914.

The spelling of 28011125 in words is "twenty-eight million, eleven thousand, one hundred twenty-five".