28419121 has 4 divisors (see below), whose sum is σ = 30090852. Its totient is φ = 26747392.

The previous prime is 28419113. The next prime is 28419137. The reversal of 28419121 is 12191482.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25391521 + 3027600 = 5039^2 + 1740^2 .

It is not a de Polignac number, because 28419121 - 2³ = 28419113 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 28419121.

It is not an unprimeable number, because it can be changed into a prime (28419151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 835840 + ... + 835873.

It is an arithmetic number, because the mean of its divisors is an integer number (7522713).

Almost surely, 2^28419121 is an apocalyptic number.

It is an amenable number.

28419121 is a deficient number, since it is larger than the sum of its proper divisors (1671731).

28419121 is a wasteful number, since it uses less digits than its factorization.

28419121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671730.

The product of its digits is 1152, while the sum is 28.

The square root of 28419121 is about 5330.9587317855. The cubic root of 28419121 is about 305.1665166155.

The spelling of 28419121 in words is "twenty-eight million, four hundred nineteen thousand, one hundred twenty-one".