5640720 has 80 divisors (see below), whose sum is σ = 18421440. Its totient is φ = 1423872.

The previous prime is 5640709. The next prime is 5640721. The reversal of 5640720 is 270465.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is not an unprimeable number, because it can be changed into a prime (5640721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3942 + ... + 5178.

It is an arithmetic number, because the mean of its divisors is an integer number (230268).

Almost surely, 2^5640720 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 5640720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9210720).

5640720 is an abundant number, since it is smaller than the sum of its proper divisors (12780720).

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

5640720 is a wasteful number, since it uses less digits than its factorization.

5640720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272 (or 1266 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 5640720 is about 2375.0199999158. The cubic root of 5640720 is about 178.0101833167.

The spelling of 5640720 in words is "five million, six hundred forty thousand, seven hundred twenty".