63640361 has 4 divisors (see below), whose sum is σ = 63663300. Its totient is φ = 63617424.

The previous prime is 63640331. The next prime is 63640363. The reversal of 63640361 is 16304636.

63640361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25694761 + 37945600 = 5069^2 + 6160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63640361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63640363) 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 3 ways as a sum of consecutive naturals, for example, 6626 + ... + 13083.

It is an arithmetic number, because the mean of its divisors is an integer number (15915825).

Almost surely, 2^63640361 is an apocalyptic number.

It is an amenable number.

63640361 is a deficient number, since it is larger than the sum of its proper divisors (22939).

63640361 is a wasteful number, since it uses less digits than its factorization.

63640361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22938.

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

The square root of 63640361 is about 7977.4908962656. The cubic root of 63640361 is about 399.2493442544.

Adding to 63640361 its reverse (16304636), we get a palindrome (79944997).

The spelling of 63640361 in words is "sixty-three million, six hundred forty thousand, three hundred sixty-one".