63640571 has 8 divisors (see below), whose sum is σ = 67455360. Its totient is φ = 59833728.

The previous prime is 63640561. The next prime is 63640573. The reversal of 63640571 is 17504636.

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

It is a cyclic number.

It is not a de Polignac number, because 63640571 - 2¹⁰ = 63639547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63640573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25445 + ... + 27833.

It is an arithmetic number, because the mean of its divisors is an integer number (8431920).

Almost surely, 2^63640571 is an apocalyptic number.

63640571 is a deficient number, since it is larger than the sum of its proper divisors (3814789).

63640571 is a wasteful number, since it uses less digits than its factorization.

63640571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3973.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 63640571 is about 7977.5040582879. The cubic root of 63640571 is about 399.2497834006.

The spelling of 63640571 in words is "sixty-three million, six hundred forty thousand, five hundred seventy-one".