64865693 has 8 divisors (see below), whose sum is σ = 69978168. Its totient is φ = 59897344.

The previous prime is 64865657. The next prime is 64865711. The reversal of 64865693 is 39656846.

It can be written as a sum of positive squares in 4 ways, for example, as 45873529 + 18992164 = 6773^2 + 4358^2 .

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 64865693 - 2¹⁶ = 64800157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64865623) 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 7 ways as a sum of consecutive naturals, for example, 35096 + ... + 36897.

It is an arithmetic number, because the mean of its divisors is an integer number (8747271).

Almost surely, 2^64865693 is an apocalyptic number.

It is an amenable number.

64865693 is a deficient number, since it is larger than the sum of its proper divisors (5112475).

64865693 is a wasteful number, since it uses less digits than its factorization.

64865693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72063.

The product of its digits is 933120, while the sum is 47.

The square root of 64865693 is about 8053.9240746359. The cubic root of 64865693 is about 401.7954558707.

The spelling of 64865693 in words is "sixty-four million, eight hundred sixty-five thousand, six hundred ninety-three".