68995639 has 16 divisors (see below), whose sum is σ = 75513600. Its totient is φ = 62774784.

The previous prime is 68995637. The next prime is 68995651. The reversal of 68995639 is 93659986.

It is a cyclic number.

It is not a de Polignac number, because 68995639 - 2¹ = 68995637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68995639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68995637) 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 15 ways as a sum of consecutive naturals, for example, 143802 + ... + 144280.

It is an arithmetic number, because the mean of its divisors is an integer number (4719600).

Almost surely, 2^68995639 is an apocalyptic number.

68995639 is a deficient number, since it is larger than the sum of its proper divisors (6517961).

68995639 is a wasteful number, since it uses less digits than its factorization.

68995639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762.

The product of its digits is 3149280, while the sum is 55.

The square root of 68995639 is about 8306.3613574176. The cubic root of 68995639 is about 410.1479517597.

The spelling of 68995639 in words is "sixty-eight million, nine hundred ninety-five thousand, six hundred thirty-nine".