28144463813885 has 16 divisors (see below), whose sum is σ = 34024161891456. Its totient is φ = 22348985638848.

The previous prime is 28144463813833. The next prime is 28144463813891. The reversal of 28144463813885 is 58831836444182.

It is not a de Polignac number, because 28144463813885 - 2¹² = 28144463809789 is a prime.

It is a super-2 number, since 2×28144463813885² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38268659 + ... + 38997168.

It is an arithmetic number, because the mean of its divisors is an integer number (2126510118216).

Almost surely, 2^{28144463813885} is an apocalyptic number.

It is an amenable number.

28144463813885 is a deficient number, since it is larger than the sum of its proper divisors (5879698077571).

28144463813885 is a wasteful number, since it uses less digits than its factorization.

28144463813885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77266372.

The product of its digits is 141557760, while the sum is 65.

The spelling of 28144463813885 in words is "twenty-eight trillion, one hundred forty-four billion, four hundred sixty-three million, eight hundred thirteen thousand, eight hundred eighty-five".