28440630093 has 16 divisors (see below), whose sum is σ = 38190117056. Its totient is φ = 18826110720.

The previous prime is 28440630041. The next prime is 28440630109. The reversal of 28440630093 is 39003604482.

It is not a de Polignac number, because 28440630093 - 2²⁰ = 28439581517 is a prime.

It is the 168644-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28440630293) by changing a digit.

It is a nontrivial repunit in base 168643.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308421 + ... + 389877.

It is an arithmetic number, because the mean of its divisors is an integer number (2386882316).

Almost surely, 2^28440630093 is an apocalyptic number.

It is an amenable number.

28440630093 is a deficient number, since it is larger than the sum of its proper divisors (9749486963).

28440630093 is a wasteful number, since it uses less digits than its factorization.

28440630093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82284.

The product of its (nonzero) digits is 124416, while the sum is 39.

The spelling of 28440630093 in words is "twenty-eight billion, four hundred forty million, six hundred thirty thousand, ninety-three".