28378922382721 has 8 divisors (see below), whose sum is σ = 28781690681088. Its totient is φ = 27976239228000.

The previous prime is 28378922382703. The next prime is 28378922382791. The reversal of 28378922382721 is 12728322987382.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28378922382721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28378922382791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20614420 + ... + 21947941.

It is an arithmetic number, because the mean of its divisors is an integer number (3597711335136).

Almost surely, 2^{28378922382721} is an apocalyptic number.

It is an amenable number.

28378922382721 is a deficient number, since it is larger than the sum of its proper divisors (402768298367).

28378922382721 is an equidigital number, since it uses as much as digits as its factorization.

28378922382721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42571823.

The product of its digits is 65028096, while the sum is 64.

The spelling of 28378922382721 in words is "twenty-eight trillion, three hundred seventy-eight billion, nine hundred twenty-two million, three hundred eighty-two thousand, seven hundred twenty-one".