68518909 has 16 divisors (see below), whose sum is σ = 75715200. Its totient is φ = 61782336.

The previous prime is 68518889. The next prime is 68518943. The reversal of 68518909 is 90981586.

It is a cyclic number.

It is not a de Polignac number, because 68518909 - 2⁷ = 68518781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68518969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27487 + ... + 29875.

It is an arithmetic number, because the mean of its divisors is an integer number (4732200).

Almost surely, 2^68518909 is an apocalyptic number.

It is an amenable number.

68518909 is a deficient number, since it is larger than the sum of its proper divisors (7196291).

68518909 is a wasteful number, since it uses less digits than its factorization.

68518909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 68518909 is about 8277.6149342670. The cubic root of 68518909 is about 409.2011193958.

The spelling of 68518909 in words is "sixty-eight million, five hundred eighteen thousand, nine hundred nine".