28394375856 has 160 divisors (see below), whose sum is σ = 92341137408. Its totient is φ = 7303461120.

The previous prime is 28394375837. The next prime is 28394375899. The reversal of 28394375856 is 65857349382.

It is a self number, because there is not a number n which added to its sum of digits gives 28394375856.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 343395 + ... + 417981.

Almost surely, 2^28394375856 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 28394375856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46170568704).

28394375856 is an abundant number, since it is smaller than the sum of its proper divisors (63946761552).

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

28394375856 is a wasteful number, since it uses less digits than its factorization.

28394375856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74719 (or 74713 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 60.

The spelling of 28394375856 in words is "twenty-eight billion, three hundred ninety-four million, three hundred seventy-five thousand, eight hundred fifty-six".