2188428813 has 8 divisors (see below), whose sum is σ = 3242116800. Its totient is φ = 1458952524.

The previous prime is 2188428779. The next prime is 2188428829. The reversal of 2188428813 is 3188248812.

It is a happy number.

2188428813 is a `hidden beast` number, since 218 + 8 + 428 + 8 + 1 + 3 = 666.

It is not a de Polignac number, because 2188428813 - 2¹² = 2188424717 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188408813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40526433 + ... + 40526486.

It is an arithmetic number, because the mean of its divisors is an integer number (405264600).

Almost surely, 2^2188428813 is an apocalyptic number.

It is an amenable number.

2188428813 is a deficient number, since it is larger than the sum of its proper divisors (1053687987).

2188428813 is an equidigital number, since it uses as much as digits as its factorization.

2188428813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81052928 (or 81052922 counting only the distinct ones).

The product of its digits is 196608, while the sum is 45.

The square root of 2188428813 is about 46780.6457095239. The cubic root of 2188428813 is about 1298.3072273138.

The spelling of 2188428813 in words is "two billion, one hundred eighty-eight million, four hundred twenty-eight thousand, eight hundred thirteen".