28281029917 has 4 divisors (see below), whose sum is σ = 32321177056. Its totient is φ = 24240882780.

The previous prime is 28281029893. The next prime is 28281029923. The reversal of 28281029917 is 71992018282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28281029917 - 2¹⁹ = 28280505629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28281029947) 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, 2020073559 + ... + 2020073572.

It is an arithmetic number, because the mean of its divisors is an integer number (8080294264).

Almost surely, 2^28281029917 is an apocalyptic number.

It is an amenable number.

28281029917 is a deficient number, since it is larger than the sum of its proper divisors (4040147139).

28281029917 is an equidigital number, since it uses as much as digits as its factorization.

28281029917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040147138.

The product of its (nonzero) digits is 290304, while the sum is 49.

The spelling of 28281029917 in words is "twenty-eight billion, two hundred eighty-one million, twenty-nine thousand, nine hundred seventeen".