5781620 has 48 divisors (see below), whose sum is σ = 13451088. Its totient is φ = 2073600.

The previous prime is 5781613. The next prime is 5781623. The reversal of 5781620 is 261875.

It can be written as a sum of positive squares in 8 ways, for example, as 126736 + 5654884 = 356^2 + 2378^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5781623) 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, 9320 + ... + 9920.

It is an arithmetic number, because the mean of its divisors is an integer number (280231).

Almost surely, 2^5781620 is an apocalyptic number.

It is a pronic number, being equal to 2404×2405.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5781620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6725544).

5781620 is an abundant number, since it is smaller than the sum of its proper divisors (7669468).

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

5781620 is a wasteful number, since it uses less digits than its factorization.

5781620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 5781620 is about 2404.4999480141. The cubic root of 5781620 is about 179.4801875490.

The spelling of 5781620 in words is "five million, seven hundred eighty-one thousand, six hundred twenty".