2188028705 has 4 divisors (see below), whose sum is σ = 2625634452. Its totient is φ = 1750422960.

The previous prime is 2188028683. The next prime is 2188028719. The reversal of 2188028705 is 5078208812.

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 1505983249 + 682045456 = 38807^2 + 26116^2 .

It is not a de Polignac number, because 2188028705 - 2⁸ = 2188028449 is a prime.

It is a super-2 number, since 2×2188028705² = 9574939227807954050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218802866 + ... + 218802875.

It is an arithmetic number, because the mean of its divisors is an integer number (656408613).

Almost surely, 2^2188028705 is an apocalyptic number.

It is an amenable number.

2188028705 is a deficient number, since it is larger than the sum of its proper divisors (437605747).

2188028705 is an equidigital number, since it uses as much as digits as its factorization.

2188028705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437605746.

The product of its (nonzero) digits is 71680, while the sum is 41.

The square root of 2188028705 is about 46776.3690873928. The cubic root of 2188028705 is about 1298.2280998037.

The spelling of 2188028705 in words is "two billion, one hundred eighty-eight million, twenty-eight thousand, seven hundred five".