63613640 has 64 divisors (see below), whose sum is σ = 146966400. Its totient is φ = 24775168.

The previous prime is 63613639. The next prime is 63613661. The reversal of 63613640 is 4631636.

63613640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 380837 + ... + 381003.

It is an arithmetic number, because the mean of its divisors is an integer number (2296350).

Almost surely, 2^63613640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63613640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73483200).

63613640 is an abundant number, since it is smaller than the sum of its proper divisors (83352760).

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

63613640 is a wasteful number, since it uses less digits than its factorization.

63613640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 63613640 is about 7975.8159457199. The cubic root of 63613640 is about 399.1934581520.

It can be divided in two parts, 6361 and 3640, that added together give a palindrome (10001).

The spelling of 63613640 in words is "sixty-three million, six hundred thirteen thousand, six hundred forty".