28308075003121 has 4 divisors (see below), whose sum is σ = 29284215520500. Its totient is φ = 27331934485744.

The previous prime is 28308075003113. The next prime is 28308075003151. The reversal of 28308075003121 is 12130057080382.

It is a happy number.

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 12835739290000 + 15472335713121 = 3582700^2 + 3933489^2 .

It is a cyclic number.

It is not a de Polignac number, because 28308075003121 - 2³ = 28308075003113 is a prime.

It is a super-2 number, since 2×28308075003121² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28308075003151) 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, 488070258646 + ... + 488070258703.

It is an arithmetic number, because the mean of its divisors is an integer number (7321053880125).

Almost surely, 2^{28308075003121} is an apocalyptic number.

It is an amenable number.

28308075003121 is a deficient number, since it is larger than the sum of its proper divisors (976140517379).

28308075003121 is an equidigital number, since it uses as much as digits as its factorization.

28308075003121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976140517378.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 28308075003121 in words is "twenty-eight trillion, three hundred eight billion, seventy-five million, three thousand, one hundred twenty-one".