28068981444 has 81 divisors (see below), whose sum is σ = 82556867757. Its totient is φ = 8017698528.

The previous prime is 28068981439. The next prime is 28068981463. The reversal of 28068981444 is 44418986082.

It is a happy number.

The square root of 28068981444 is 167538.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 13233741444 + 14835240000 = 115038^2 + 121800^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7034602 + ... + 7038590.

Almost surely, 2^28068981444 is an apocalyptic number.

28068981444 is the 167538-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28068981444

28068981444 is an abundant number, since it is smaller than the sum of its proper divisors (54487886313).

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

28068981444 is an equidigital number, since it uses as much as digits as its factorization.

28068981444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8002 (or 4001 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 54.

The spelling of 28068981444 in words is "twenty-eight billion, sixty-eight million, nine hundred eighty-one thousand, four hundred forty-four".