63644645 has 16 divisors (see below), whose sum is σ = 77648112. Its totient is φ = 50073600.

The previous prime is 63644641. The next prime is 63644663. The reversal of 63644645 is 54644636.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 187489 + 63457156 = 433^2 + 7966^2 .

It is not a de Polignac number, because 63644645 - 2² = 63644641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63644599 and 63644608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63644641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97139 + ... + 97791.

It is an arithmetic number, because the mean of its divisors is an integer number (4853007).

Almost surely, 2^63644645 is an apocalyptic number.

It is an amenable number.

63644645 is a deficient number, since it is larger than the sum of its proper divisors (14003467).

63644645 is a wasteful number, since it uses less digits than its factorization.

63644645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952.

The product of its digits is 207360, while the sum is 38.

The square root of 63644645 is about 7977.7593972243. The cubic root of 63644645 is about 399.2583026460.

Subtracting from 63644645 its reverse (54644636), we obtain a palindrome (9000009).

The spelling of 63644645 in words is "sixty-three million, six hundred forty-four thousand, six hundred forty-five".