13563640 has 16 divisors (see below), whose sum is σ = 30518280. Its totient is φ = 5425440.

The previous prime is 13563623. The next prime is 13563653. The reversal of 13563640 is 4636531.

It is a junction number, because it is equal to n+sod(n) for n = 13563599 and 13563608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169506 + ... + 169585.

Almost surely, 2^13563640 is an apocalyptic number.

13563640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13563640 is an abundant number, since it is smaller than the sum of its proper divisors (16954640).

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

13563640 is a wasteful number, since it uses less digits than its factorization.

13563640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339102 (or 339098 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 13563640 is about 3682.8847388969. The cubic root of 13563640 is about 238.4837277039.

The spelling of 13563640 in words is "thirteen million, five hundred sixty-three thousand, six hundred forty".