28645835816 has 64 divisors (see below), whose sum is σ = 58638323520. Its totient is φ = 13039810560.

The previous prime is 28645835807. The next prime is 28645835923. The reversal of 28645835816 is 61853854682.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5806871 + ... + 5811801.

It is an arithmetic number, because the mean of its divisors is an integer number (916223805).

Almost surely, 2^28645835816 is an apocalyptic number.

28645835816 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 28645835816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29319161760).

28645835816 is an abundant number, since it is smaller than the sum of its proper divisors (29992487704).

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

28645835816 is a wasteful number, since it uses less digits than its factorization.

28645835816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5706 (or 5702 counting only the distinct ones).

The product of its digits is 11059200, while the sum is 56.

The spelling of 28645835816 in words is "twenty-eight billion, six hundred forty-five million, eight hundred thirty-five thousand, eight hundred sixteen".