28860121 has 4 divisors (see below), whose sum is σ = 28925712. Its totient is φ = 28794532.

The previous prime is 28860109. The next prime is 28860127. The reversal of 28860121 is 12106882.

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 28860121 - 2⁵ = 28860089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28860121.

It is not an unprimeable number, because it can be changed into a prime (28860127) 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, 32131 + ... + 33016.

It is an arithmetic number, because the mean of its divisors is an integer number (7231428).

Almost surely, 2^28860121 is an apocalyptic number.

It is an amenable number.

28860121 is a deficient number, since it is larger than the sum of its proper divisors (65591).

28860121 is an equidigital number, since it uses as much as digits as its factorization.

28860121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65590.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 28860121 is about 5372.1616691980. The cubic root of 28860121 is about 306.7369177169.

The spelling of 28860121 in words is "twenty-eight million, eight hundred sixty thousand, one hundred twenty-one".