63727986 has 64 divisors (see below), whose sum is σ = 156192768. Its totient is φ = 16936128.

The previous prime is 63727969. The next prime is 63727987. The reversal of 63727986 is 68972736.

It is a super-2 number, since 2×63727986² = 8122512399232392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63727987) 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, 34851 + ... + 36633.

It is an arithmetic number, because the mean of its divisors is an integer number (2440512).

Almost surely, 2^63727986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63727986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78096384).

63727986 is an abundant number, since it is smaller than the sum of its proper divisors (92464782).

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

63727986 is a wasteful number, since it uses less digits than its factorization.

63727986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855.

The product of its digits is 762048, while the sum is 48.

The square root of 63727986 is about 7982.9810221496. The cubic root of 63727986 is about 399.4324994051.

The spelling of 63727986 in words is "sixty-three million, seven hundred twenty-seven thousand, nine hundred eighty-six".