28420565056 has 63 divisors (see below), whose sum is σ = 61106701383. Its totient is φ = 13109091840.

The previous prime is 28420565053. The next prime is 28420565111. The reversal of 28420565056 is 65056502482.

The square root of 28420565056 is 168584.

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 325441600 + 28095123456 = 18040^2 + 167616^2 .

It is not an unprimeable number, because it can be changed into a prime (28420565053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17531926 + ... + 17533546.

It is an arithmetic number, because the mean of its divisors is an integer number (969947641).

Almost surely, 2^28420565056 is an apocalyptic number.

28420565056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28420565056 is the 168584-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28420565056

28420565056 is an abundant number, since it is smaller than the sum of its proper divisors (32686136327).

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

28420565056 is an frugal number, since it uses more digits than its factorization.

28420565056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280 (or 1636 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 43.

The spelling of 28420565056 in words is "twenty-eight billion, four hundred twenty million, five hundred sixty-five thousand, fifty-six".