28281433856 has 72 divisors (see below), whose sum is σ = 60939031104. Its totient is φ = 13022023680.

The previous prime is 28281433837. The next prime is 28281433877. The reversal of 28281433856 is 65833418282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1424510 + ... + 1444226.

It is an arithmetic number, because the mean of its divisors is an integer number (846375432).

Almost surely, 2^28281433856 is an apocalyptic number.

28281433856 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28281433856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30469515552).

28281433856 is an abundant number, since it is smaller than the sum of its proper divisors (32657597248).

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

28281433856 is a wasteful number, since it uses less digits than its factorization.

28281433856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20177 (or 20163 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 50.

The spelling of 28281433856 in words is "twenty-eight billion, two hundred eighty-one million, four hundred thirty-three thousand, eight hundred fifty-six".