2809988893 has 4 divisors (see below), whose sum is σ = 2900633728. Its totient is φ = 2719344060.

The previous prime is 2809988879. The next prime is 2809988903. The reversal of 2809988893 is 3988899082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2809988893 - 2²⁵ = 2776434461 is a prime.

It is a super-3 number, since 3×2809988893³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2809988813) 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, 45322371 + ... + 45322432.

It is an arithmetic number, because the mean of its divisors is an integer number (725158432).

Almost surely, 2^2809988893 is an apocalyptic number.

It is an amenable number.

2809988893 is a deficient number, since it is larger than the sum of its proper divisors (90644835).

2809988893 is an equidigital number, since it uses as much as digits as its factorization.

2809988893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90644834.

The product of its (nonzero) digits is 17915904, while the sum is 64.

The square root of 2809988893 is about 53009.3283583182. The cubic root of 2809988893 is about 1411.1338218496.

The spelling of 2809988893 in words is "two billion, eight hundred nine million, nine hundred eighty-eight thousand, eight hundred ninety-three".