2164644 has 72 divisors (see below), whose sum is σ = 6054048. Its totient is φ = 673920.

The previous prime is 2164639. The next prime is 2164681. The reversal of 2164644 is 4464612.

2164644 is a `hidden beast` number, since 2 + 16 + 4 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16459 + ... + 16589.

It is an arithmetic number, because the mean of its divisors is an integer number (84084).

2^2164644 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 2164644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3027024).

2164644 is an abundant number, since it is smaller than the sum of its proper divisors (3889404).

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

2164644 is a wasteful number, since it uses less digits than its factorization.

2164644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 153 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 2164644 is about 1471.2729182582. The cubic root of 2164644 is about 129.3586557803.

Subtracting 2164644 from its reverse (4464612), we obtain a cube (2299968 = 132³).

The spelling of 2164644 in words is "two million, one hundred sixty-four thousand, six hundred forty-four".