2817872845 has 4 divisors (see below), whose sum is σ = 3381447420. Its totient is φ = 2254298272.

The previous prime is 2817872839. The next prime is 2817872891. The reversal of 2817872845 is 5482787182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5482787182 = 2 ⋅2741393591.

It can be written as a sum of positive squares in 2 ways, for example, as 284461956 + 2533410889 = 16866^2 + 50333^2 .

It is a cyclic number.

It is not a de Polignac number, because 2817872845 - 2²¹ = 2815775693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2817872792 and 2817872801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281787280 + ... + 281787289.

It is an arithmetic number, because the mean of its divisors is an integer number (845361855).

Almost surely, 2^2817872845 is an apocalyptic number.

It is an amenable number.

2817872845 is a deficient number, since it is larger than the sum of its proper divisors (563574575).

2817872845 is an equidigital number, since it uses as much as digits as its factorization.

2817872845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563574574.

The product of its digits is 2007040, while the sum is 52.

The square root of 2817872845 is about 53083.6400880723. The cubic root of 2817872845 is about 1412.4523232400.

The spelling of 2817872845 in words is "two billion, eight hundred seventeen million, eight hundred seventy-two thousand, eight hundred forty-five".