63728418 has 32 divisors (see below), whose sum is σ = 138692736. Its totient is φ = 19404288.

The previous prime is 63728417. The next prime is 63728429. The reversal of 63728418 is 81482736.

63728418 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×63728418² = 8122622521565448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (63728411) 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 15 ways as a sum of consecutive naturals, for example, 3355 + ... + 11777.

It is an arithmetic number, because the mean of its divisors is an integer number (4334148).

Almost surely, 2^63728418 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63728418, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69346368).

63728418 is an abundant number, since it is smaller than the sum of its proper divisors (74964318).

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

63728418 is a wasteful number, since it uses less digits than its factorization.

63728418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8538.

The product of its digits is 64512, while the sum is 39.

The square root of 63728418 is about 7983.0080796652. The cubic root of 63728418 is about 399.4334019623.

It can be divided in two parts, 63728 and 418, that added together give a palindrome (64146).

The spelling of 63728418 in words is "sixty-three million, seven hundred twenty-eight thousand, four hundred eighteen".