13581648 has 80 divisors (see below), whose sum is σ = 39432000. Its totient is φ = 4475520.

The previous prime is 13581643. The next prime is 13581671. The reversal of 13581648 is 84618531.

13581648 is a `hidden beast` number, since 1 + 3 + 5 + 8 + 1 + 648 = 666.

It is a super-2 number, since 2×13581648² = 368922324791808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13581641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64263 + ... + 64473.

It is an arithmetic number, because the mean of its divisors is an integer number (492900).

Almost surely, 2^13581648 is an apocalyptic number.

13581648 is a gapful number since it is divisible by the number (18) 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 13581648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19716000).

13581648 is an abundant number, since it is smaller than the sum of its proper divisors (25850352).

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

13581648 is a wasteful number, since it uses less digits than its factorization.

13581648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 365 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 13581648 is about 3685.3287506001. The cubic root of 13581648 is about 238.5892233713.

The spelling of 13581648 in words is "thirteen million, five hundred eighty-one thousand, six hundred forty-eight".