28265343109 has 2 divisors, whose sum is σ = 28265343110. Its totient is φ = 28265343108.

The previous prime is 28265343107. The next prime is 28265343137. The reversal of 28265343109 is 90134356282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27696282084 + 569061025 = 166422^2 + 23855^2 .

It is a cyclic number.

It is not a de Polignac number, because 28265343109 - 2¹ = 28265343107 is a prime.

Together with 28265343107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28265343107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14132671554 + 14132671555.

It is an arithmetic number, because the mean of its divisors is an integer number (14132671555).

Almost surely, 2^28265343109 is an apocalyptic number.

It is an amenable number.

28265343109 is a deficient number, since it is larger than the sum of its proper divisors (1).

28265343109 is an equidigital number, since it uses as much as digits as its factorization.

28265343109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 28265343109 in words is "twenty-eight billion, two hundred sixty-five million, three hundred forty-three thousand, one hundred nine".