28328895521 has 2 divisors, whose sum is σ = 28328895522. Its totient is φ = 28328895520.

The previous prime is 28328895487. The next prime is 28328895577. The reversal of 28328895521 is 12559882382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26289379600 + 2039515921 = 162140^2 + 45161^2 .

It is a cyclic number.

It is not a de Polignac number, because 28328895521 - 2⁶ = 28328895457 is a prime.

It is a super-2 number, since 2×28328895521² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28328892521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14164447760 + 14164447761.

It is an arithmetic number, because the mean of its divisors is an integer number (14164447761).

Almost surely, 2^28328895521 is an apocalyptic number.

It is an amenable number.

28328895521 is a deficient number, since it is larger than the sum of its proper divisors (1).

28328895521 is an equidigital number, since it uses as much as digits as its factorization.

28328895521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2764800, while the sum is 53.

The spelling of 28328895521 in words is "twenty-eight billion, three hundred twenty-eight million, eight hundred ninety-five thousand, five hundred twenty-one".