68917639 has 8 divisors (see below), whose sum is σ = 79712640. Its totient is φ = 58360056.

The previous prime is 68917633. The next prime is 68917657. The reversal of 68917639 is 93671986.

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 68917639 - 2³ = 68917631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68917592 and 68917601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68917631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58729 + ... + 59890.

It is an arithmetic number, because the mean of its divisors is an integer number (9964080).

Almost surely, 2^68917639 is an apocalyptic number.

68917639 is a deficient number, since it is larger than the sum of its proper divisors (10795001).

68917639 is a wasteful number, since it uses less digits than its factorization.

68917639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118709.

The product of its digits is 489888, while the sum is 49.

The square root of 68917639 is about 8301.6648330320. The cubic root of 68917639 is about 409.9933352079.

The spelling of 68917639 in words is "sixty-eight million, nine hundred seventeen thousand, six hundred thirty-nine".