68449091 has 4 divisors (see below), whose sum is σ = 68468400. Its totient is φ = 68429784.

The previous prime is 68449067. The next prime is 68449093. The reversal of 68449091 is 19094486.

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 68449091 - 2¹⁸ = 68186947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68449093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2636 + ... + 11993.

It is an arithmetic number, because the mean of its divisors is an integer number (17117100).

Almost surely, 2^68449091 is an apocalyptic number.

68449091 is a deficient number, since it is larger than the sum of its proper divisors (19309).

68449091 is a wasteful number, since it uses less digits than its factorization.

68449091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19308.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 68449091 is about 8273.3965818157. The cubic root of 68449091 is about 409.0620856924.

The spelling of 68449091 in words is "sixty-eight million, four hundred forty-nine thousand, ninety-one".