13663520 has 48 divisors (see below), whose sum is σ = 34768440. Its totient is φ = 5044224.

The previous prime is 13663501. The next prime is 13663577. The reversal of 13663520 is 2536631.

It can be written as a sum of positive squares in 4 ways, for example, as 11316496 + 2347024 = 3364^2 + 1532^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 13663520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1205 + ... + 5364.

Almost surely, 2^13663520 is an apocalyptic number.

13663520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13663520 is an abundant number, since it is smaller than the sum of its proper divisors (21104920).

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

13663520 is a wasteful number, since it uses less digits than its factorization.

13663520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6597 (or 6589 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 13663520 is about 3696.4198895688. The cubic root of 13663520 is about 239.0676792276.

The spelling of 13663520 in words is "thirteen million, six hundred sixty-three thousand, five hundred twenty".