68019989 has 8 divisors (see below), whose sum is σ = 68923008. Its totient is φ = 67121280.

The previous prime is 68019961. The next prime is 68020031. The reversal of 68019989 is 98991086.

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 68019989 - 2⁸ = 68019733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68019089) 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, 40994 + ... + 42620.

It is an arithmetic number, because the mean of its divisors is an integer number (8615376).

Almost surely, 2^68019989 is an apocalyptic number.

It is an amenable number.

68019989 is a deficient number, since it is larger than the sum of its proper divisors (903019).

68019989 is a wasteful number, since it uses less digits than its factorization.

68019989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 68019989 is about 8247.4231733312. The cubic root of 68019989 is about 408.2055004911.

The spelling of 68019989 in words is "sixty-eight million, nineteen thousand, nine hundred eighty-nine".