28863121 has 4 divisors (see below), whose sum is σ = 32986432. Its totient is φ = 24739812.

The previous prime is 28863119. The next prime is 28863151. The reversal of 28863121 is 12136882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28863121 - 2¹ = 28863119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28863151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2061645 + ... + 2061658.

It is an arithmetic number, because the mean of its divisors is an integer number (8246608).

Almost surely, 2^28863121 is an apocalyptic number.

It is an amenable number.

28863121 is a deficient number, since it is larger than the sum of its proper divisors (4123311).

28863121 is an equidigital number, since it uses as much as digits as its factorization.

28863121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4123310.

The product of its digits is 4608, while the sum is 31.

The square root of 28863121 is about 5372.4408791535. The cubic root of 28863121 is about 306.7475457489.

The spelling of 28863121 in words is "twenty-eight million, eight hundred sixty-three thousand, one hundred twenty-one".