63644649 has 16 divisors (see below), whose sum is σ = 86329152. Its totient is φ = 41700608.

The previous prime is 63644641. The next prime is 63644663. The reversal of 63644649 is 94644636.

It is a cyclic number.

It is not a de Polignac number, because 63644649 - 2³ = 63644641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63644649.

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, 57469 + ... + 58565.

It is an arithmetic number, because the mean of its divisors is an integer number (5395572).

Almost surely, 2^63644649 is an apocalyptic number.

It is an amenable number.

63644649 is a deficient number, since it is larger than the sum of its proper divisors (22684503).

63644649 is a wasteful number, since it uses less digits than its factorization.

63644649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416.

The product of its digits is 373248, while the sum is 42.

The square root of 63644649 is about 7977.7596479212. The cubic root of 63644649 is about 399.2583110103.

The spelling of 63644649 in words is "sixty-three million, six hundred forty-four thousand, six hundred forty-nine".