28265343129 has 9 divisors (see below), whose sum is σ = 40828446399. Its totient is φ = 18843225840.

The previous prime is 28265343109. The next prime is 28265343137. The reversal of 28265343129 is 92134356282.

The square root of 28265343129 is 168123.

It is a perfect power (a square), and thus also a powerful number.

28265343129 is a `hidden beast` number, since 2 + 82 + 6 + 534 + 31 + 2 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21468989529 + 6796353600 = 146523^2 + 82440^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 28265343129 - 2¹⁵ = 28265310361 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28265343109) 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, 476349 + ... + 532389.

Almost surely, 2^28265343129 is an apocalyptic number.

28265343129 is the 168123-rd square number.

28265343129 is the 84062-nd centered octagonal number.

It is an amenable number.

28265343129 is a deficient number, since it is larger than the sum of its proper divisors (12563103270).

28265343129 is an frugal number, since it uses more digits than its factorization.

28265343129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112088 (or 56044 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 28265343129 in words is "twenty-eight billion, two hundred sixty-five million, three hundred forty-three thousand, one hundred twenty-nine".