28220171144 has 64 divisors (see below), whose sum is σ = 58312949760. Its totient is φ = 12696747840.

The previous prime is 28220171143. The next prime is 28220171159. The reversal of 28220171144 is 44117102282.

It is a self number, because there is not a number n which added to its sum of digits gives 28220171144.

It is not an unprimeable number, because it can be changed into a prime (28220171143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5216489 + ... + 5221895.

It is an arithmetic number, because the mean of its divisors is an integer number (911139840).

Almost surely, 2^28220171144 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 28220171144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29156474880).

28220171144 is an abundant number, since it is smaller than the sum of its proper divisors (30092778616).

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

28220171144 is a wasteful number, since it uses less digits than its factorization.

28220171144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6018 (or 6014 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The spelling of 28220171144 in words is "twenty-eight billion, two hundred twenty million, one hundred seventy-one thousand, one hundred forty-four".