2168845380 has 144 divisors (see below), whose sum is σ = 7501791024. Its totient is φ = 502456320.

The previous prime is 2168845373. The next prime is 2168845387. The reversal of 2168845380 is 835488612.

It is an interprime number because it is at equal distance from previous prime (2168845373) and next prime (2168845387).

It can be written as a sum of positive squares in 8 ways, for example, as 60933636 + 2107911744 = 7806^2 + 45912^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (2168845387) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12520 + ... + 67040.

It is an arithmetic number, because the mean of its divisors is an integer number (52095771).

Almost surely, 2^2168845380 is an apocalyptic number.

2168845380 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 2168845380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3750895512).

2168845380 is an abundant number, since it is smaller than the sum of its proper divisors (5332945644).

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

2168845380 is a wasteful number, since it uses less digits than its factorization.

2168845380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54566 (or 54561 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The square root of 2168845380 is about 46570.8640675691. The cubic root of 2168845380 is about 1294.4229287863.

The spelling of 2168845380 in words is "two billion, one hundred sixty-eight million, eight hundred forty-five thousand, three hundred eighty".