13581660 has 48 divisors (see below), whose sum is σ = 38963232. Its totient is φ = 3532800.

The previous prime is 13581643. The next prime is 13581671. The reversal of 13581660 is 6618531.

It is a super-2 number, since 2×13581660² = 368922976711200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301 + ... + 5220.

It is an arithmetic number, because the mean of its divisors is an integer number (811734).

Almost surely, 2^13581660 is an apocalyptic number.

13581660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13581660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19481616).

13581660 is an abundant number, since it is smaller than the sum of its proper divisors (25381572).

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

13581660 is a wasteful number, since it uses less digits than its factorization.

13581660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5574 (or 5572 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 13581660 is about 3685.3303786771. The cubic root of 13581660 is about 238.5892936394.

It can be divided in two parts, 13581 and 660, that added together give a palindrome (14241).

The spelling of 13581660 in words is "thirteen million, five hundred eighty-one thousand, six hundred sixty".