68639617 has 8 divisors (see below), whose sum is σ = 70785792. Its totient is φ = 66516000.

The previous prime is 68639587. The next prime is 68639621. The reversal of 68639617 is 71693686.

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 68639617 - 2¹⁹ = 68115329 is a prime.

It is a super-2 number, since 2×68639617² = 9422794043813378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68639657) 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, 648 + ... + 11734.

It is an arithmetic number, because the mean of its divisors is an integer number (8848224).

Almost surely, 2^68639617 is an apocalyptic number.

It is an amenable number.

68639617 is a deficient number, since it is larger than the sum of its proper divisors (2146175).

68639617 is a wasteful number, since it uses less digits than its factorization.

68639617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11279.

The product of its digits is 326592, while the sum is 46.

The square root of 68639617 is about 8284.9029565831. The cubic root of 68639617 is about 409.4412714575.

The spelling of 68639617 in words is "sixty-eight million, six hundred thirty-nine thousand, six hundred seventeen".