28369121 has 16 divisors (see below), whose sum is σ = 32543808. Its totient is φ = 24494400.

The previous prime is 28369091. The next prime is 28369127. The reversal of 28369121 is 12196382.

28369121 = T₃₃₄ + T₃₃₅ + ... + T₅₉₁.

It is a cyclic number.

It is not a de Polignac number, because 28369121 - 2⁶ = 28369057 is a prime.

It is a super-3 number, since 3×28369121³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28369127) 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 15 ways as a sum of consecutive naturals, for example, 16691 + ... + 18311.

It is an arithmetic number, because the mean of its divisors is an integer number (2033988).

Almost surely, 2^28369121 is an apocalyptic number.

It is an amenable number.

28369121 is a deficient number, since it is larger than the sum of its proper divisors (4174687).

28369121 is a wasteful number, since it uses less digits than its factorization.

28369121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712.

The product of its digits is 5184, while the sum is 32.

The square root of 28369121 is about 5326.2670792967. The cubic root of 28369121 is about 304.9874437185.

The spelling of 28369121 in words is "twenty-eight million, three hundred sixty-nine thousand, one hundred twenty-one".