28164778288 has 80 divisors (see below), whose sum is σ = 62464439520. Its totient is φ = 12216987648.

The previous prime is 28164778273. The next prime is 28164778319. The reversal of 28164778288 is 88287746182.

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, 117570 + ... + 264862.

It is an arithmetic number, because the mean of its divisors is an integer number (780805494).

Almost surely, 2^28164778288 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 28164778288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31232219760).

28164778288 is an abundant number, since it is smaller than the sum of its proper divisors (34299661232).

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

28164778288 is a wasteful number, since it uses less digits than its factorization.

28164778288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147374 (or 147368 counting only the distinct ones).

The product of its digits is 19267584, while the sum is 61.

The spelling of 28164778288 in words is "twenty-eight billion, one hundred sixty-four million, seven hundred seventy-eight thousand, two hundred eighty-eight".