28144911993 has 8 divisors (see below), whose sum is σ = 40938053856. Its totient is φ = 17057522400.

The previous prime is 28144911973. The next prime is 28144912001. The reversal of 28144911993 is 39911944182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28144911993 - 2¹⁴ = 28144895609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28144911913) 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 7 ways as a sum of consecutive naturals, for example, 426438028 + ... + 426438093.

It is an arithmetic number, because the mean of its divisors is an integer number (5117256732).

Almost surely, 2^28144911993 is an apocalyptic number.

It is an amenable number.

28144911993 is a deficient number, since it is larger than the sum of its proper divisors (12793141863).

28144911993 is a wasteful number, since it uses less digits than its factorization.

28144911993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852876135.

The product of its digits is 559872, while the sum is 51.

The spelling of 28144911993 in words is "twenty-eight billion, one hundred forty-four million, nine hundred eleven thousand, nine hundred ninety-three".