63644065 has 8 divisors (see below), whose sum is σ = 76773888. Its totient is φ = 50647920.

The previous prime is 63644057. The next prime is 63644071. The reversal of 63644065 is 56044636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63644065 - 2³ = 63644057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63644065.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32367 + ... + 34276.

It is an arithmetic number, because the mean of its divisors is an integer number (9596736).

Almost surely, 2^63644065 is an apocalyptic number.

It is an amenable number.

63644065 is a deficient number, since it is larger than the sum of its proper divisors (13129823).

63644065 is a wasteful number, since it uses less digits than its factorization.

63644065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66839.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 63644065 is about 7977.7230460828. The cubic root of 63644065 is about 399.2570898154.

The spelling of 63644065 in words is "sixty-three million, six hundred forty-four thousand, sixty-five".