64638071 has 8 divisors (see below), whose sum is σ = 67054800. Its totient is φ = 62233920.

The previous prime is 64638061. The next prime is 64638103. The reversal of 64638071 is 17083646.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64638071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64638031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8051 + ... + 13931.

It is an arithmetic number, because the mean of its divisors is an integer number (8381850).

Almost surely, 2^64638071 is an apocalyptic number.

64638071 is a deficient number, since it is larger than the sum of its proper divisors (2416729).

64638071 is a wasteful number, since it uses less digits than its factorization.

64638071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 64638071 is about 8039.7805318305. The cubic root of 64638071 is about 401.3249211975.

The spelling of 64638071 in words is "sixty-four million, six hundred thirty-eight thousand, seventy-one".