28122728296 has 16 divisors (see below), whose sum is σ = 56786278500. Its totient is φ = 12979720704.

The previous prime is 28122728243. The next prime is 28122728297. The reversal of 28122728296 is 69282722182.

It can be written as a sum of positive squares in 2 ways, for example, as 27698944900 + 423783396 = 166430^2 + 20586^2 .

It is not an unprimeable number, because it can be changed into a prime (28122728297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135205321 + ... + 135205528.

Almost surely, 2^28122728296 is an apocalyptic number.

28122728296 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28122728296 is an abundant number, since it is smaller than the sum of its proper divisors (28663550204).

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

28122728296 is a wasteful number, since it uses less digits than its factorization.

28122728296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270410868 (or 270410864 counting only the distinct ones).

The product of its digits is 774144, while the sum is 49.

The spelling of 28122728296 in words is "twenty-eight billion, one hundred twenty-two million, seven hundred twenty-eight thousand, two hundred ninety-six".