63615816 has 96 divisors (see below), whose sum is σ = 192067200. Its totient is φ = 18856320.

The previous prime is 63615767. The next prime is 63615817. The reversal of 63615816 is 61851636.

It is a happy number.

63615816 is a `hidden beast` number, since 636 + 1 + 5 + 8 + 16 = 666.

63615816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (63615817) 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, 36370 + ... + 38078.

It is an arithmetic number, because the mean of its divisors is an integer number (2000700).

Almost surely, 2^63615816 is an apocalyptic number.

63615816 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63615816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96033600).

63615816 is an abundant number, since it is smaller than the sum of its proper divisors (128451384).

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

63615816 is a wasteful number, since it uses less digits than its factorization.

63615816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779 (or 1772 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 63615816 is about 7975.9523569289. The cubic root of 63615816 is about 399.1980097705.

The spelling of 63615816 in words is "sixty-three million, six hundred fifteen thousand, eight hundred sixteen".