68640717 has 8 divisors (see below), whose sum is σ = 95500224. Its totient is φ = 43770848.

The previous prime is 68640703. The next prime is 68640721. The reversal of 68640717 is 71704686.

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 68640717 - 2⁴ = 68640701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68640317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497328 + ... + 497465.

It is an arithmetic number, because the mean of its divisors is an integer number (11937528).

Almost surely, 2^68640717 is an apocalyptic number.

It is an amenable number.

68640717 is a deficient number, since it is larger than the sum of its proper divisors (26859507).

68640717 is a wasteful number, since it uses less digits than its factorization.

68640717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994819.

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

The square root of 68640717 is about 8284.9693421279. The cubic root of 68640717 is about 409.4434586443.

The spelling of 68640717 in words is "sixty-eight million, six hundred forty thousand, seven hundred seventeen".