28021938056 has 64 divisors (see below), whose sum is σ = 61389619200. Its totient is φ = 11741424192.

The previous prime is 28021937989. The next prime is 28021938101. The reversal of 28021938056 is 65083912082.

It is a junction number, because it is equal to n+sod(n) for n = 28021937998 and 28021938016.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2729525 + ... + 2739771.

It is an arithmetic number, because the mean of its divisors is an integer number (959212800).

Almost surely, 2^28021938056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28021938056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30694809600).

28021938056 is an abundant number, since it is smaller than the sum of its proper divisors (33367681144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28021938056 is a wasteful number, since it uses less digits than its factorization.

28021938056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11346 (or 11342 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 28021938056 in words is "twenty-eight billion, twenty-one million, nine hundred thirty-eight thousand, fifty-six".