68906009 has 4 divisors (see below), whose sum is σ = 69448704. Its totient is φ = 68363316.

The previous prime is 68905979. The next prime is 68906021. The reversal of 68906009 is 90060986.

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 68906009 - 2²⁴ = 52128793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68906209) 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, 271157 + ... + 271410.

It is an arithmetic number, because the mean of its divisors is an integer number (17362176).

Almost surely, 2^68906009 is an apocalyptic number.

It is an amenable number.

68906009 is a deficient number, since it is larger than the sum of its proper divisors (542695).

68906009 is a wasteful number, since it uses less digits than its factorization.

68906009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542694.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 68906009 is about 8300.9643415690. The cubic root of 68906009 is about 409.9702714911.

The spelling of 68906009 in words is "sixty-eight million, nine hundred six thousand, nine".