63889686 has 48 divisors (see below), whose sum is σ = 158899104. Its totient is φ = 18173952.

The previous prime is 63889681. The next prime is 63889687. The reversal of 63889686 is 68698836.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63889681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31396 + ... + 33368.

It is an arithmetic number, because the mean of its divisors is an integer number (3310398).

Almost surely, 2^63889686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63889686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79449552).

63889686 is an abundant number, since it is smaller than the sum of its proper divisors (95009418).

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

63889686 is a wasteful number, since it uses less digits than its factorization.

63889686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245 (or 2242 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 63889686 is about 7993.1024014459. The cubic root of 63889686 is about 399.7700469960.

The spelling of 63889686 in words is "sixty-three million, eight hundred eighty-nine thousand, six hundred eighty-six".