2165604000 has 576 divisors, whose sum is σ = 8604610560. Its totient is φ = 474163200.

The previous prime is 2165603941. The next prime is 2165604017. The reversal of 2165604000 is 4065612.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17051937 + ... + 17052063.

It is an arithmetic number, because the mean of its divisors is an integer number (14938560).

Almost surely, 2^2165604000 is an apocalyptic number.

2165604000 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 2165604000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4302305280).

2165604000 is an abundant number, since it is smaller than the sum of its proper divisors (6439006560).

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

2165604000 is a wasteful number, since it uses less digits than its factorization.

2165604000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2165604000 is about 46536.0505414888. The cubic root of 2165604000 is about 1293.7777608457. Note that the first 4 decimals are identical.

Adding to 2165604000 its reverse (4065612), we get a palindrome (2169669612).

The spelling of 2165604000 in words is "two billion, one hundred sixty-five million, six hundred four thousand".