2809858869 has 16 divisors (see below), whose sum is σ = 4165272000. Its totient is φ = 1872106128.

The previous prime is 2809858853. The next prime is 2809858897. The reversal of 2809858869 is 9688589082.

It is not a de Polignac number, because 2809858869 - 2⁴ = 2809858853 is a prime.

It is a super-2 number, since 2×2809858869² = 15790613727395918322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2809858819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15247 + ... + 76499.

It is an arithmetic number, because the mean of its divisors is an integer number (260329500).

Almost surely, 2^2809858869 is an apocalyptic number.

It is an amenable number.

2809858869 is a deficient number, since it is larger than the sum of its proper divisors (1355413131).

2809858869 is a wasteful number, since it uses less digits than its factorization.

2809858869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62961 (or 62955 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 63.

The square root of 2809858869 is about 53008.1019184803. The cubic root of 2809858869 is about 1411.1120561533.

The spelling of 2809858869 in words is "two billion, eight hundred nine million, eight hundred fifty-eight thousand, eight hundred sixty-nine".