28268121 has 16 divisors (see below), whose sum is σ = 43300224. Its totient is φ = 16068864.

The previous prime is 28268117. The next prime is 28268129. The reversal of 28268121 is 12186282.

It is not a de Polignac number, because 28268121 - 2² = 28268117 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28268129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 721 + ... + 7553.

It is an arithmetic number, because the mean of its divisors is an integer number (2706264).

Almost surely, 2^28268121 is an apocalyptic number.

28268121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28268121 is a deficient number, since it is larger than the sum of its proper divisors (15032103).

28268121 is a wasteful number, since it uses less digits than its factorization.

28268121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040.

The product of its digits is 3072, while the sum is 30.

The square root of 28268121 is about 5316.7773133732. Note that the first 3 decimals coincide. The cubic root of 28268121 is about 304.6250736590.

The spelling of 28268121 in words is "twenty-eight million, two hundred sixty-eight thousand, one hundred twenty-one".