68903665 has 4 divisors (see below), whose sum is σ = 82684404. Its totient is φ = 55122928.

The previous prime is 68903663. The next prime is 68903683. The reversal of 68903665 is 56630986.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37015056 + 31888609 = 6084^2 + 5647^2 .

It is a cyclic number.

It is not a de Polignac number, because 68903665 - 2¹ = 68903663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68903663) 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, 6890362 + ... + 6890371.

It is an arithmetic number, because the mean of its divisors is an integer number (20671101).

Almost surely, 2^68903665 is an apocalyptic number.

It is an amenable number.

68903665 is a deficient number, since it is larger than the sum of its proper divisors (13780739).

68903665 is a wasteful number, since it uses less digits than its factorization.

68903665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13780738.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 68903665 is about 8300.8231519531. The cubic root of 68903665 is about 409.9656227373.

The spelling of 68903665 in words is "sixty-eight million, nine hundred three thousand, six hundred sixty-five".