28813888664 has 128 divisors (see below), whose sum is σ = 65026368000. Its totient is φ = 11815372800.

The previous prime is 28813888661. The next prime is 28813888669. The reversal of 28813888664 is 46688831882.

It is a junction number, because it is equal to n+sod(n) for n = 28813888597 and 28813888606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28813888661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9266342 + ... + 9269450.

It is an arithmetic number, because the mean of its divisors is an integer number (508018500).

Almost surely, 2^28813888664 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 28813888664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32513184000).

28813888664 is an abundant number, since it is smaller than the sum of its proper divisors (36212479336).

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

28813888664 is a wasteful number, since it uses less digits than its factorization.

28813888664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3409 (or 3405 counting only the distinct ones).

The product of its digits is 28311552, while the sum is 62.

The spelling of 28813888664 in words is "twenty-eight billion, eight hundred thirteen million, eight hundred eighty-eight thousand, six hundred sixty-four".