64680717 has 4 divisors (see below), whose sum is σ = 86240960. Its totient is φ = 43120476.

The previous prime is 64680713. The next prime is 64680743. The reversal of 64680717 is 71708646.

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 not a de Polignac number, because 64680717 - 2² = 64680713 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 (64680713) 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, 10780117 + ... + 10780122.

It is an arithmetic number, because the mean of its divisors is an integer number (21560240).

Almost surely, 2^64680717 is an apocalyptic number.

It is an amenable number.

64680717 is a deficient number, since it is larger than the sum of its proper divisors (21560243).

64680717 is a wasteful number, since it uses less digits than its factorization.

64680717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21560242.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 64680717 is about 8042.4322813437. The cubic root of 64680717 is about 401.4131619704.

The spelling of 64680717 in words is "sixty-four million, six hundred eighty thousand, seven hundred seventeen".