28897538069 has 2 divisors, whose sum is σ = 28897538070. Its totient is φ = 28897538068.

The previous prime is 28897538063. The next prime is 28897538081. The reversal of 28897538069 is 96083579882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27221700100 + 1675837969 = 164990^2 + 40937^2 .

It is a cyclic number.

It is not a de Polignac number, because 28897538069 - 2⁸ = 28897537813 is a prime.

It is a super-3 number, since 3×28897538069³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 28897537996 and 28897538014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28897538063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14448769034 + 14448769035.

It is an arithmetic number, because the mean of its divisors is an integer number (14448769035).

Almost surely, 2^28897538069 is an apocalyptic number.

It is an amenable number.

28897538069 is a deficient number, since it is larger than the sum of its proper divisors (1).

28897538069 is an equidigital number, since it uses as much as digits as its factorization.

28897538069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52254720, while the sum is 65.

The spelling of 28897538069 in words is "twenty-eight billion, eight hundred ninety-seven million, five hundred thirty-eight thousand, sixty-nine".