68691009 has 32 divisors (see below), whose sum is σ = 97763328. Its totient is φ = 42840000.

The previous prime is 68690989. The next prime is 68691011. The reversal of 68691009 is 90019686.

It is not a de Polignac number, because 68691009 - 2⁸ = 68690753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68691059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 666852 + ... + 666954.

It is an arithmetic number, because the mean of its divisors is an integer number (3055104).

Almost surely, 2^68691009 is an apocalyptic number.

It is an amenable number.

68691009 is a deficient number, since it is larger than the sum of its proper divisors (29072319).

68691009 is a wasteful number, since it uses less digits than its factorization.

68691009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 68691009 is about 8288.0039213311. The cubic root of 68691009 is about 409.5434318782.

The spelling of 68691009 in words is "sixty-eight million, six hundred ninety-one thousand, nine".