68640011 has 4 divisors (see below), whose sum is σ = 74880024. Its totient is φ = 62400000.

The previous prime is 68640001. The next prime is 68640023. The reversal of 68640011 is 11004686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68640011 - 2⁶ = 68639947 is a prime.

It is a super-2 number, since 2×68640011² = 9422902220160242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68640001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3119990 + ... + 3120011.

It is an arithmetic number, because the mean of its divisors is an integer number (18720006).

Almost surely, 2^68640011 is an apocalyptic number.

68640011 is a deficient number, since it is larger than the sum of its proper divisors (6240013).

68640011 is a wasteful number, since it uses less digits than its factorization.

68640011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6240012.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 68640011 is about 8284.9267347394. The cubic root of 68640011 is about 409.4420548707.

Adding to 68640011 its reverse (11004686), we get a palindrome (79644697).

The spelling of 68640011 in words is "sixty-eight million, six hundred forty thousand, eleven".