64678717 has 4 divisors (see below), whose sum is σ = 68082880. Its totient is φ = 61274556.

The previous prime is 64678699. The next prime is 64678723. The reversal of 64678717 is 71787646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64678717 - 2⁷ = 64678589 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 (64670717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1702053 + ... + 1702090.

It is an arithmetic number, because the mean of its divisors is an integer number (17020720).

Almost surely, 2^64678717 is an apocalyptic number.

It is an amenable number.

64678717 is a deficient number, since it is larger than the sum of its proper divisors (3404163).

64678717 is a wasteful number, since it uses less digits than its factorization.

64678717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3404162.

The product of its digits is 395136, while the sum is 46.

The square root of 64678717 is about 8042.3079398889. The cubic root of 64678717 is about 401.4090245466.

The spelling of 64678717 in words is "sixty-four million, six hundred seventy-eight thousand, seven hundred seventeen".