563638986 has 48 divisors (see below), whose sum is σ = 1283877504. Its totient is φ = 185294304.

The previous prime is 563638939. The next prime is 563638987. The reversal of 563638986 is 689836365.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (563638987) 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 23 ways as a sum of consecutive naturals, for example, 27535 + ... + 43421.

It is an arithmetic number, because the mean of its divisors is an integer number (26747448).

Almost surely, 2^563638986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 563638986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (641938752).

563638986 is an abundant number, since it is smaller than the sum of its proper divisors (720238518).

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

563638986 is a wasteful number, since it uses less digits than its factorization.

563638986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15977 (or 15965 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 563638986 is about 23741.0822415491. The cubic root of 563638986 is about 826.0385993879.

The spelling of 563638986 in words is "five hundred sixty-three million, six hundred thirty-eight thousand, nine hundred eighty-six".