2118078820 has 96 divisors (see below), whose sum is σ = 5238769536. Its totient is φ = 709171200.

The previous prime is 2118078817. The next prime is 2118078863. The reversal of 2118078820 is 288708112.

It is a self number, because there is not a number n which added to its sum of digits gives 2118078820.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1632412 + ... + 1633708.

It is an arithmetic number, because the mean of its divisors is an integer number (54570516).

Almost surely, 2^2118078820 is an apocalyptic number.

2118078820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2118078820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2619384768).

2118078820 is an abundant number, since it is smaller than the sum of its proper divisors (3120690716).

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

2118078820 is a wasteful number, since it uses less digits than its factorization.

2118078820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901 (or 1899 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 2118078820 is about 46022.5903225796. The cubic root of 2118078820 is about 1284.2434887595.

It can be divided in two parts, 21180 and 78820, that added together give a 5-th power (100000 = 10⁵).

The spelling of 2118078820 in words is "two billion, one hundred eighteen million, seventy-eight thousand, eight hundred twenty".