28212938117 has 32 divisors (see below), whose sum is σ = 35820164352. Its totient is φ = 21622754304.

The previous prime is 28212938093. The next prime is 28212938153. The reversal of 28212938117 is 71183921282.

It is a cyclic number.

It is not a de Polignac number, because 28212938117 - 2²⁴ = 28196160901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28212938617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 745853 + ... + 782765.

It is an arithmetic number, because the mean of its divisors is an integer number (1119380136).

Almost surely, 2^28212938117 is an apocalyptic number.

It is an amenable number.

28212938117 is a deficient number, since it is larger than the sum of its proper divisors (7607226235).

28212938117 is a wasteful number, since it uses less digits than its factorization.

28212938117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37197.

The product of its digits is 96768, while the sum is 44.

The spelling of 28212938117 in words is "twenty-eight billion, two hundred twelve million, nine hundred thirty-eight thousand, one hundred seventeen".