28288771722 has 128 divisors (see below), whose sum is σ = 65623219200. Its totient is φ = 9026035200.

The previous prime is 28288771697. The next prime is 28288771729. The reversal of 28288771722 is 22717788282.

It is a happy number.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (28288771729) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34456072 + ... + 34456892.

It is an arithmetic number, because the mean of its divisors is an integer number (512681400).

Almost surely, 2^28288771722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28288771722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32811609600).

28288771722 is an abundant number, since it is smaller than the sum of its proper divisors (37334447478).

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

28288771722 is a wasteful number, since it uses less digits than its factorization.

28288771722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149 (or 1143 counting only the distinct ones).

The product of its digits is 2809856, while the sum is 54.

The spelling of 28288771722 in words is "twenty-eight billion, two hundred eighty-eight million, seven hundred seventy-one thousand, seven hundred twenty-two".