68668509 has 16 divisors (see below), whose sum is σ = 112687232. Its totient is φ = 36220608.

The previous prime is 68668429. The next prime is 68668513. The reversal of 68668509 is 90586686.

It is not a de Polignac number, because 68668509 - 2⁹ = 68667997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68668529) 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, 125494 + ... + 126039.

It is an arithmetic number, because the mean of its divisors is an integer number (7042952).

Almost surely, 2^68668509 is an apocalyptic number.

It is an amenable number.

68668509 is a deficient number, since it is larger than the sum of its proper divisors (44018723).

68668509 is a wasteful number, since it uses less digits than its factorization.

68668509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251556.

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 68668509 is about 8286.6464266312. The cubic root of 68668509 is about 409.4987111613.

The spelling of 68668509 in words is "sixty-eight million, six hundred sixty-eight thousand, five hundred nine".