64563644 has 12 divisors (see below), whose sum is σ = 114105768. Its totient is φ = 31962000.

The previous prime is 64563547. The next prime is 64563647. The reversal of 64563644 is 44636546.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 64563598 and 64563607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64563647) 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, 79502 + ... + 80309.

It is an arithmetic number, because the mean of its divisors is an integer number (9508814).

Almost surely, 2^64563644 is an apocalyptic number.

It is an amenable number.

64563644 is a deficient number, since it is larger than the sum of its proper divisors (49542124).

64563644 is a wasteful number, since it uses less digits than its factorization.

64563644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159916 (or 159914 counting only the distinct ones).

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

The square root of 64563644 is about 8035.1505275259. The cubic root of 64563644 is about 401.1708278947.

The spelling of 64563644 in words is "sixty-four million, five hundred sixty-three thousand, six hundred forty-four".