2178815328 has 96 divisors (see below), whose sum is σ = 6363100800. Its totient is φ = 725332608.

The previous prime is 2178815299. The next prime is 2178815357. The reversal of 2178815328 is 8235188712.

It is an interprime number because it is at equal distance from previous prime (2178815299) and next prime (2178815357).

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 1086775 + ... + 1088777.

It is an arithmetic number, because the mean of its divisors is an integer number (66282300).

Almost surely, 2^2178815328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2178815328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3181550400).

2178815328 is an abundant number, since it is smaller than the sum of its proper divisors (4184285472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2178815328 is a wasteful number, since it uses less digits than its factorization.

2178815328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281 (or 3267 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 2178815328 is about 46677.7819524450. The cubic root of 2178815328 is about 1296.4033381099.

The spelling of 2178815328 in words is "two billion, one hundred seventy-eight million, eight hundred fifteen thousand, three hundred twenty-eight".