28921125 has 32 divisors (see below), whose sum is σ = 48477312. Its totient is φ = 15312000.

The previous prime is 28921117. The next prime is 28921129. The reversal of 28921125 is 52112982.

It is not a de Polignac number, because 28921125 - 2³ = 28921117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28921092 and 28921101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28921129) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 87210 + ... + 87540.

It is an arithmetic number, because the mean of its divisors is an integer number (1514916).

Almost surely, 2^28921125 is an apocalyptic number.

28921125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28921125 is a deficient number, since it is larger than the sum of its proper divisors (19556187).

28921125 is a wasteful number, since it uses less digits than its factorization.

28921125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582 (or 572 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 28921125 is about 5377.8364608828. The cubic root of 28921125 is about 306.9528905917.

The spelling of 28921125 in words is "twenty-eight million, nine hundred twenty-one thousand, one hundred twenty-five".