27028129969 has 4 divisors (see below), whose sum is σ = 27041120100. Its totient is φ = 27015139840.

The previous prime is 27028129957. The next prime is 27028130011. The reversal of 27028129969 is 96992182072.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20082574369 + 6945555600 = 141713^2 + 83340^2 .

It is a cyclic number.

It is not a de Polignac number, because 27028129969 - 2¹¹ = 27028127921 is a prime.

It is a super-2 number, since 2×27028129969² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27028129939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6491944 + ... + 6496105.

It is an arithmetic number, because the mean of its divisors is an integer number (6760280025).

Almost surely, 2^27028129969 is an apocalyptic number.

It is an amenable number.

27028129969 is a deficient number, since it is larger than the sum of its proper divisors (12990131).

27028129969 is a wasteful number, since it uses less digits than its factorization.

27028129969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12990130.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 27028129969 in words is "twenty-seven billion, twenty-eight million, one hundred twenty-nine thousand, nine hundred sixty-nine".