28384194421 has 4 divisors (see below), whose sum is σ = 30964575744. Its totient is φ = 25803813100.

The previous prime is 28384194389. The next prime is 28384194451. The reversal of 28384194421 is 12449148382.

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 28384194421 - 2⁵ = 28384194389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28384194451) 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, 1290190645 + ... + 1290190666.

It is an arithmetic number, because the mean of its divisors is an integer number (7741143936).

Almost surely, 2^28384194421 is an apocalyptic number.

It is an amenable number.

28384194421 is a deficient number, since it is larger than the sum of its proper divisors (2580381323).

28384194421 is a wasteful number, since it uses less digits than its factorization.

28384194421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580381322.

The product of its digits is 442368, while the sum is 46.

The spelling of 28384194421 in words is "twenty-eight billion, three hundred eighty-four million, one hundred ninety-four thousand, four hundred twenty-one".