28644208516 has 135 divisors (see below), whose sum is σ = 64689982917. Its totient is φ = 11088997920.

The previous prime is 28644208513. The next prime is 28644208591. The reversal of 28644208516 is 61580244682.

The square root of 28644208516 is 169246.

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., 8396056900 + 20248151616 = 91630^2 + 142296^2 .

It is not an unprimeable number, because it can be changed into a prime (28644208511) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 182447110 + ... + 182447266.

Almost surely, 2^28644208516 is an apocalyptic number.

28644208516 is the 169246-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28644208516

28644208516 is an abundant number, since it is smaller than the sum of its proper divisors (36045774401).

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

28644208516 is an equidigital number, since it uses as much as digits as its factorization.

28644208516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 46.

The spelling of 28644208516 in words is "twenty-eight billion, six hundred forty-four million, two hundred eight thousand, five hundred sixteen".