28405885956 has 96 divisors (see below), whose sum is σ = 80625549312. Its totient is φ = 7598492160.

The previous prime is 28405885919. The next prime is 28405886011. The reversal of 28405885956 is 65958850482.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28405885956.

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 31 ways as a sum of consecutive naturals, for example, 220675 + ... + 324821.

It is an arithmetic number, because the mean of its divisors is an integer number (839849472).

Almost surely, 2^28405885956 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 28405885956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40312774656).

28405885956 is an abundant number, since it is smaller than the sum of its proper divisors (52219663356).

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

28405885956 is a wasteful number, since it uses less digits than its factorization.

28405885956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104369 (or 104367 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 60.

The spelling of 28405885956 in words is "twenty-eight billion, four hundred five million, eight hundred eighty-five thousand, nine hundred fifty-six".