63649644 has 12 divisors (see below), whose sum is σ = 148515864. Its totient is φ = 21216544.

The previous prime is 63649643. The next prime is 63649679. The reversal of 63649644 is 44694636.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 63649596 and 63649605.

It is not an unprimeable number, because it can be changed into a prime (63649643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2652057 + ... + 2652080.

It is an arithmetic number, because the mean of its divisors is an integer number (12376322).

Almost surely, 2^63649644 is an apocalyptic number.

It is an amenable number.

63649644 is an abundant number, since it is smaller than the sum of its proper divisors (84866220).

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

63649644 is a wasteful number, since it uses less digits than its factorization.

63649644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5304144 (or 5304142 counting only the distinct ones).

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

The square root of 63649644 is about 7978.0726995936. The cubic root of 63649644 is about 399.2687556857.

The spelling of 63649644 in words is "sixty-three million, six hundred forty-nine thousand, six hundred forty-four".