64989717 has 8 divisors (see below), whose sum is σ = 93318624. Its totient is φ = 39993648.

The previous prime is 64989707. The next prime is 64989719. The reversal of 64989717 is 71798946.

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

It is not a de Polignac number, because 64989717 - 2⁶ = 64989653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64989717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64989719) 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, 833163 + ... + 833240.

It is an arithmetic number, because the mean of its divisors is an integer number (11664828).

Almost surely, 2^64989717 is an apocalyptic number.

It is an amenable number.

64989717 is a deficient number, since it is larger than the sum of its proper divisors (28328907).

64989717 is a wasteful number, since it uses less digits than its factorization.

64989717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666419.

The product of its digits is 762048, while the sum is 51.

The square root of 64989717 is about 8061.6199984867. The cubic root of 64989717 is about 402.0513721136.

The spelling of 64989717 in words is "sixty-four million, nine hundred eighty-nine thousand, seven hundred seventeen".