13555616 has 36 divisors (see below), whose sum is σ = 27667458. Its totient is φ = 6532992.

The previous prime is 13555601. The next prime is 13555631. The reversal of 13555616 is 61655531.

It is an interprime number because it is at equal distance from previous prime (13555601) and next prime (13555631).

It can be written as a sum of positive squares in only one way, i.e., 8976016 + 4579600 = 2996^2 + 2140^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 126635 + ... + 126741.

Almost surely, 2^13555616 is an apocalyptic number.

13555616 is a gapful number since it is divisible by the number (16) 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 13555616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13833729).

13555616 is an abundant number, since it is smaller than the sum of its proper divisors (14111842).

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

13555616 is an equidigital number, since it uses as much as digits as its factorization.

13555616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 146 counting only the distinct ones).

The product of its digits is 13500, while the sum is 32.

The square root of 13555616 is about 3681.7952142942. The cubic root of 13555616 is about 238.4366908980.

The spelling of 13555616 in words is "thirteen million, five hundred fifty-five thousand, six hundred sixteen".