64998717 has 16 divisors (see below), whose sum is σ = 99715200. Its totient is φ = 36891072.

The previous prime is 64998683. The next prime is 64998721. The reversal of 64998717 is 71789946.

It is not a de Polignac number, because 64998717 - 2¹⁵ = 64965949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64998717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64998737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7258 + ... + 13515.

It is an arithmetic number, because the mean of its divisors is an integer number (6232200).

Almost surely, 2^64998717 is an apocalyptic number.

It is an amenable number.

64998717 is a deficient number, since it is larger than the sum of its proper divisors (34716483).

64998717 is a wasteful number, since it uses less digits than its factorization.

64998717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20932.

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

The square root of 64998717 is about 8062.1781796237. The cubic root of 64998717 is about 402.0699304101.

The spelling of 64998717 in words is "sixty-four million, nine hundred ninety-eight thousand, seven hundred seventeen".