5781540 has 48 divisors (see below), whose sum is σ = 16313472. Its totient is φ = 1529856.

The previous prime is 5781539. The next prime is 5781541. The reversal of 5781540 is 451875.

It is an interprime number because it is at equal distance from previous prime (5781539) and next prime (5781541).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a d-powerful number, because it can be written as 5² + 7⁸ + 8² + 1 + 5⁶ + 4⁵ + 0 .

It is a junction number, because it is equal to n+sod(n) for n = 5781498 and 5781507.

It is not an unprimeable number, because it can be changed into a prime (5781541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9732 + ... + 10308.

It is an arithmetic number, because the mean of its divisors is an integer number (339864).

Almost surely, 2^5781540 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 5781540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8156736).

5781540 is an abundant number, since it is smaller than the sum of its proper divisors (10531932).

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

5781540 is a wasteful number, since it uses less digits than its factorization.

5781540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756 (or 754 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 5781540 is about 2404.4833124811. The cubic root of 5781540 is about 179.4793597256.

The spelling of 5781540 in words is "five million, seven hundred eighty-one thousand, five hundred forty".