64000071 has 16 divisors (see below), whose sum is σ = 98085600. Its totient is φ = 41194944.

The previous prime is 64000067. The next prime is 64000091. The reversal of 64000071 is 17000046.

It is not a de Polignac number, because 64000071 - 2² = 64000067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64000031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40086 + ... + 41651.

It is an arithmetic number, because the mean of its divisors is an integer number (6130350).

Almost surely, 2^64000071 is an apocalyptic number.

64000071 is a deficient number, since it is larger than the sum of its proper divisors (34085529).

64000071 is a wasteful number, since it uses less digits than its factorization.

64000071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81775 (or 81769 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 64000071 is about 8000.0044374988. The cubic root of 64000071 is about 400.0001479166. Note that the first 3 decimals are identical.

The spelling of 64000071 in words is "sixty-four million, seventy-one", and thus it is an aban number.