28071143881 has 8 divisors (see below), whose sum is σ = 30631860000. Its totient is φ = 25511893440.

The previous prime is 28071143861. The next prime is 28071143897. The reversal of 28071143881 is 18834117082.

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

It is not a de Polignac number, because 28071143881 - 2¹³ = 28071135689 is a prime.

It is a super-2 number, since 2×28071143881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28071143861) 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, 326176 + ... + 403153.

It is an arithmetic number, because the mean of its divisors is an integer number (3828982500).

Almost surely, 2^28071143881 is an apocalyptic number.

It is an amenable number.

28071143881 is a deficient number, since it is larger than the sum of its proper divisors (2560716119).

28071143881 is a wasteful number, since it uses less digits than its factorization.

28071143881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732839.

The product of its (nonzero) digits is 86016, while the sum is 43.

The spelling of 28071143881 in words is "twenty-eight billion, seventy-one million, one hundred forty-three thousand, eight hundred eighty-one".