28120606864 has 135 divisors (see below), whose sum is σ = 65174079243. Its totient is φ = 11719658496.

The previous prime is 28120606847. The next prime is 28120606873. The reversal of 28120606864 is 46860602182.

The square root of 28120606864 is 167692.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4748312464 + 23372294400 = 68908^2 + 152880^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28120606864.

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, 248854872 + ... + 248854984.

Almost surely, 2^28120606864 is an apocalyptic number.

28120606864 is the 167692-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28120606864

28120606864 is an abundant number, since it is smaller than the sum of its proper divisors (37053472379).

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

28120606864 is an equidigital number, since it uses as much as digits as its factorization.

28120606864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The spelling of 28120606864 in words is "twenty-eight billion, one hundred twenty million, six hundred six thousand, eight hundred sixty-four".