2178873808 has 20 divisors (see below), whose sum is σ = 4263368868. Its totient is φ = 1078649600.

The previous prime is 2178873779. The next prime is 2178873821. The reversal of 2178873808 is 8083788712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1776791104 + 402082704 = 42152^2 + 20052^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 672541 + ... + 675772.

Almost surely, 2^2178873808 is an apocalyptic number.

It is an amenable number.

2178873808 is a deficient number, since it is larger than the sum of its proper divisors (2084495060).

2178873808 is a wasteful number, since it uses less digits than its factorization.

2178873808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348422 (or 1348416 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 52.

The square root of 2178873808 is about 46678.4083704661. The cubic root of 2178873808 is about 1296.4149366130.

The spelling of 2178873808 in words is "two billion, one hundred seventy-eight million, eight hundred seventy-three thousand, eight hundred eight".