64263618 has 40 divisors (see below), whose sum is σ = 144893628. Its totient is φ = 21288096.

The previous prime is 64263611. The next prime is 64263659. The reversal of 64263618 is 81636246.

64263618 is a `hidden beast` number, since 6 + 4 + 2 + 636 + 18 = 666.

64263618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 63154809 + 1108809 = 7947^2 + 1053^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64263611) 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 19 ways as a sum of consecutive naturals, for example, 26880 + ... + 29172.

Almost surely, 2^64263618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64263618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72446814).

64263618 is an abundant number, since it is smaller than the sum of its proper divisors (80630010).

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

64263618 is a wasteful number, since it uses less digits than its factorization.

64263618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480 (or 2471 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 64263618 is about 8016.4591934345. The cubic root of 64263618 is about 400.5484518245.

It can be divided in two parts, 6 and 4263618, that added together give a palindrome (4263624).

The spelling of 64263618 in words is "sixty-four million, two hundred sixty-three thousand, six hundred eighteen".