5621640 has 64 divisors (see below), whose sum is σ = 17107200. Its totient is φ = 1477632.

The previous prime is 5621617. The next prime is 5621653. The reversal of 5621640 is 461265.

It is a Cunningham number, because it is equal to 2371²-1.

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

It is a self number, because there is not a number n which added to its sum of digits gives 5621640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9184 + ... + 9776.

It is an arithmetic number, because the mean of its divisors is an integer number (267300).

Almost surely, 2^5621640 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 5621640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8553600).

5621640 is an abundant number, since it is smaller than the sum of its proper divisors (11485560).

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

5621640 is a wasteful number, since it uses less digits than its factorization.

5621640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686 (or 682 counting only the distinct ones).

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

The square root of 5621640 is about 2370.9997891185. Note that the first 3 decimals coincide. The cubic root of 5621640 is about 177.8092473226.

The spelling of 5621640 in words is "five million, six hundred twenty-one thousand, six hundred forty".