5581440 has 256 divisors, whose sum is σ = 22032000. Its totient is φ = 1327104.

The previous prime is 5581403. The next prime is 5581447. The reversal of 5581440 is 441855.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5581447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 293751 + ... + 293769.

Almost surely, 2^5581440 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 5581440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11016000).

5581440 is an abundant number, since it is smaller than the sum of its proper divisors (16450560).

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

5581440 is a wasteful number, since it uses less digits than its factorization.

5581440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 5581440 is about 2362.5071428463. The cubic root of 5581440 is about 177.3843987082.

The spelling of 5581440 in words is "five million, five hundred eighty-one thousand, four hundred forty".