13644555 has 8 divisors (see below), whose sum is σ = 21831312. Its totient is φ = 7277088.

The previous prime is 13644551. The next prime is 13644569. The reversal of 13644555 is 55544631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13644555 - 2² = 13644551 is a prime.

It is a super-2 number, since 2×13644555² = 372347762296050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13644551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454804 + ... + 454833.

It is an arithmetic number, because the mean of its divisors is an integer number (2728914).

Almost surely, 2^13644555 is an apocalyptic number.

13644555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13644555 is a deficient number, since it is larger than the sum of its proper divisors (8186757).

13644555 is an equidigital number, since it uses as much as digits as its factorization.

13644555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909645.

The product of its digits is 36000, while the sum is 33.

The square root of 13644555 is about 3693.8536787480. The cubic root of 13644555 is about 238.9570191671.

The spelling of 13644555 in words is "thirteen million, six hundred forty-four thousand, five hundred fifty-five".