28669093081 has 4 divisors (see below), whose sum is σ = 28677375232. Its totient is φ = 28660810932.

The previous prime is 28669093051. The next prime is 28669093099. The reversal of 28669093081 is 18039096682.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18039096682 = 2 ⋅9019548341.

It is a cyclic number.

It is not a de Polignac number, because 28669093081 - 2¹⁵ = 28669060313 is a prime.

It is a super-2 number, since 2×28669093081² (a number of 22 digits) contains 22 as substring.

It is the 169320-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28669093001) by changing a digit.

It is a nontrivial repunit in base 169319.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4135881 + ... + 4142806.

It is an arithmetic number, because the mean of its divisors is an integer number (7169343808).

Almost surely, 2^28669093081 is an apocalyptic number.

It is an amenable number.

28669093081 is a deficient number, since it is larger than the sum of its proper divisors (8282151).

28669093081 is an equidigital number, since it uses as much as digits as its factorization.

28669093081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8282150.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 28669093081 in words is "twenty-eight billion, six hundred sixty-nine million, ninety-three thousand, eighty-one".