28084012071 has 4 divisors (see below), whose sum is σ = 37445349432.
Its totient is φ = 18722674712.
The previous prime is 28084012057. The next prime is 28084012091. The reversal of 28084012071 is 17021048082.
It is a happy number.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 28084012071 - 29 = 28084011559 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (28084012091) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4680668676 + ... + 4680668681.
It is an arithmetic number, because the mean of its divisors is an integer number (9361337358).
Almost surely, 228084012071 is an apocalyptic number.
28084012071 is a deficient number, since it is larger than the sum of its proper divisors (9361337361).
28084012071 is an equidigital number, since it uses as much as digits as its factorization.
28084012071 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 9361337360.
The product of its (nonzero) digits is 7168, while the sum is 33.
The spelling of 28084012071 in words is "twenty-eight billion, eighty-four million, twelve thousand, seventy-one".