68905509 has 4 divisors (see below), whose sum is σ = 91874016. Its totient is φ = 45937004.

The previous prime is 68905489. The next prime is 68905517. The reversal of 68905509 is 90550986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68905509 - 2¹³ = 68897317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68905559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11484249 + ... + 11484254.

It is an arithmetic number, because the mean of its divisors is an integer number (22968504).

Almost surely, 2^68905509 is an apocalyptic number.

It is an amenable number.

68905509 is a deficient number, since it is larger than the sum of its proper divisors (22968507).

68905509 is a wasteful number, since it uses less digits than its factorization.

68905509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22968506.

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 68905509 is about 8300.9342245316. The cubic root of 68905509 is about 409.9692798716.

The spelling of 68905509 in words is "sixty-eight million, nine hundred five thousand, five hundred nine".