68447765 has 4 divisors (see below), whose sum is σ = 82137324. Its totient is φ = 54758208.

The previous prime is 68447719. The next prime is 68447773. The reversal of 68447765 is 56774486.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56774486 = 2 ⋅28387243.

It can be written as a sum of positive squares in 2 ways, for example, as 50112241 + 18335524 = 7079^2 + 4282^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68447765 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 6844772 + ... + 6844781.

It is an arithmetic number, because the mean of its divisors is an integer number (20534331).

Almost surely, 2^68447765 is an apocalyptic number.

It is an amenable number.

68447765 is a deficient number, since it is larger than the sum of its proper divisors (13689559).

68447765 is a wasteful number, since it uses less digits than its factorization.

68447765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13689558.

The product of its digits is 1128960, while the sum is 47.

The square root of 68447765 is about 8273.3164450539. The cubic root of 68447765 is about 409.0594442167.

The spelling of 68447765 in words is "sixty-eight million, four hundred forty-seven thousand, seven hundred sixty-five".