27958473209 has 4 divisors (see below), whose sum is σ = 27972938916. Its totient is φ = 27944007504.

The previous prime is 27958473199. The next prime is 27958473233. The reversal of 27958473209 is 90237485972.

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 19508267584 + 8450205625 = 139672^2 + 91925^2 .

It is a cyclic number.

It is not a de Polignac number, because 27958473209 - 2¹² = 27958469113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27958473269) 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, 7229954 + ... + 7233819.

It is an arithmetic number, because the mean of its divisors is an integer number (6993234729).

Almost surely, 2^27958473209 is an apocalyptic number.

It is an amenable number.

27958473209 is a deficient number, since it is larger than the sum of its proper divisors (14465707).

27958473209 is a wasteful number, since it uses less digits than its factorization.

27958473209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14465706.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The spelling of 27958473209 in words is "twenty-seven billion, nine hundred fifty-eight million, four hundred seventy-three thousand, two hundred nine".