64971689 has 4 divisors (see below), whose sum is σ = 64997760. Its totient is φ = 64945620.

The previous prime is 64971661. The next prime is 64971703. The reversal of 64971689 is 98617946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64971689 - 2²⁰ = 63923113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64971289) 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 3 ways as a sum of consecutive naturals, for example, 8849 + ... + 14430.

It is an arithmetic number, because the mean of its divisors is an integer number (16249440).

Almost surely, 2^64971689 is an apocalyptic number.

It is an amenable number.

64971689 is a deficient number, since it is larger than the sum of its proper divisors (26071).

64971689 is a wasteful number, since it uses less digits than its factorization.

64971689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26070.

The product of its digits is 653184, while the sum is 50.

The square root of 64971689 is about 8060.5017833879. The cubic root of 64971689 is about 402.0141926295.

The spelling of 64971689 in words is "sixty-four million, nine hundred seventy-one thousand, six hundred eighty-nine".