64517689 has 8 divisors (see below), whose sum is σ = 65744712. Its totient is φ = 63302400.

The previous prime is 64517653. The next prime is 64517701. The reversal of 64517689 is 98671546.

It can be written as a sum of positive squares in 4 ways, for example, as 15405625 + 49112064 = 3925^2 + 7008^2 .

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 64517689 - 2⁷ = 64517561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64587689) 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, 8587 + ... + 14239.

It is an arithmetic number, because the mean of its divisors is an integer number (8218089).

Almost surely, 2^64517689 is an apocalyptic number.

It is an amenable number.

64517689 is a deficient number, since it is larger than the sum of its proper divisors (1227023).

64517689 is a wasteful number, since it uses less digits than its factorization.

64517689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5867.

The product of its digits is 362880, while the sum is 46.

The square root of 64517689 is about 8032.2903956468. The cubic root of 64517689 is about 401.0756237413.

The spelling of 64517689 in words is "sixty-four million, five hundred seventeen thousand, six hundred eighty-nine".