28057746728 has 64 divisors (see below), whose sum is σ = 60443712000. Its totient is φ = 12075825600.

The previous prime is 28057746707. The next prime is 28057746749. The reversal of 28057746728 is 82764775082.

It is an interprime number because it is at equal distance from previous prime (28057746707) and next prime (28057746749).

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, 4442693 + ... + 4449003.

It is an arithmetic number, because the mean of its divisors is an integer number (944433000).

Almost surely, 2^28057746728 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 28057746728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30221856000).

28057746728 is an abundant number, since it is smaller than the sum of its proper divisors (32385965272).

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

28057746728 is a wasteful number, since it uses less digits than its factorization.

28057746728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9006 (or 9002 counting only the distinct ones).

The product of its (nonzero) digits is 10536960, while the sum is 56.

The spelling of 28057746728 in words is "twenty-eight billion, fifty-seven million, seven hundred forty-six thousand, seven hundred twenty-eight".