28340186821 has 8 divisors (see below), whose sum is σ = 30455127360. Its totient is φ = 26275009728.

The previous prime is 28340186807. The next prime is 28340186827. The reversal of 28340186821 is 12868104382.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28340186821 - 2⁵ = 28340186789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28340186827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12439681 + ... + 12441958.

It is an arithmetic number, because the mean of its divisors is an integer number (3806890920).

Almost surely, 2^28340186821 is an apocalyptic number.

It is an amenable number.

28340186821 is a deficient number, since it is larger than the sum of its proper divisors (2114940539).

28340186821 is a wasteful number, since it uses less digits than its factorization.

28340186821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24881723.

The product of its (nonzero) digits is 147456, while the sum is 43.

The spelling of 28340186821 in words is "twenty-eight billion, three hundred forty million, one hundred eighty-six thousand, eight hundred twenty-one".