68664009 has 4 divisors (see below), whose sum is σ = 91552016. Its totient is φ = 45776004.

The previous prime is 68663999. The next prime is 68664017. The reversal of 68664009 is 90046686.

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 not a de Polignac number, because 68664009 - 2¹¹ = 68661961 is a prime.

It is a super-2 number, since 2×68664009² = 9429492263904162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68664049) 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, 11443999 + ... + 11444004.

It is an arithmetic number, because the mean of its divisors is an integer number (22888004).

Almost surely, 2^68664009 is an apocalyptic number.

It is an amenable number.

68664009 is a deficient number, since it is larger than the sum of its proper divisors (22888007).

68664009 is a wasteful number, since it uses less digits than its factorization.

68664009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22888006.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 68664009 is about 8286.3749010047. The cubic root of 68664009 is about 409.4897658457.

The spelling of 68664009 in words is "sixty-eight million, six hundred sixty-four thousand, nine".