63686370 has 64 divisors (see below), whose sum is σ = 169620480. Its totient is φ = 15172800.

The previous prime is 63686323. The next prime is 63686377. The reversal of 63686370 is 7368636.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (63686377) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17835 + ... + 21105.

It is an arithmetic number, because the mean of its divisors is an integer number (2650320).

Almost surely, 2^63686370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63686370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84810240).

63686370 is an abundant number, since it is smaller than the sum of its proper divisors (105934110).

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

63686370 is a wasteful number, since it uses less digits than its factorization.

63686370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3351.

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 63686370 is about 7980.3740513838. The cubic root of 63686370 is about 399.3455339361.

The spelling of 63686370 in words is "sixty-three million, six hundred eighty-six thousand, three hundred seventy".