64659865 has 8 divisors (see below), whose sum is σ = 77888448. Its totient is φ = 51530160.

The previous prime is 64659851. The next prime is 64659883. The reversal of 64659865 is 56895646.

It is a happy number.

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

It is not a de Polignac number, because 64659865 - 2⁷ = 64659737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23271 + ... + 25900.

It is an arithmetic number, because the mean of its divisors is an integer number (9736056).

Almost surely, 2^64659865 is an apocalyptic number.

It is an amenable number.

64659865 is a deficient number, since it is larger than the sum of its proper divisors (13228583).

64659865 is a wasteful number, since it uses less digits than its factorization.

64659865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49439.

The product of its digits is 1555200, while the sum is 49.

The square root of 64659865 is about 8041.1358028577. The cubic root of 64659865 is about 401.3700209989.

The spelling of 64659865 in words is "sixty-four million, six hundred fifty-nine thousand, eight hundred sixty-five".