28393706121 has 16 divisors (see below), whose sum is σ = 42260401920. Its totient is φ = 16808112720.

The previous prime is 28393706101. The next prime is 28393706123. The reversal of 28393706121 is 12160739382.

It is not a de Polignac number, because 28393706121 - 2¹⁰ = 28393705097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28393706123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10003411 + ... + 10006248.

It is an arithmetic number, because the mean of its divisors is an integer number (2641275120).

Almost surely, 2^28393706121 is an apocalyptic number.

It is an amenable number.

28393706121 is a deficient number, since it is larger than the sum of its proper divisors (13866695799).

28393706121 is a wasteful number, since it uses less digits than its factorization.

28393706121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20009716.

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 28393706121 in words is "twenty-eight billion, three hundred ninety-three million, seven hundred six thousand, one hundred twenty-one".