68197765 has 4 divisors (see below), whose sum is σ = 81837324. Its totient is φ = 54558208.

The previous prime is 68197751. The next prime is 68197769. The reversal of 68197765 is 56779186.

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 17489124 + 50708641 = 4182^2 + 7121^2 .

It is a cyclic number.

It is not a de Polignac number, because 68197765 - 2²¹ = 66100613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68197769) 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, 6819772 + ... + 6819781.

It is an arithmetic number, because the mean of its divisors is an integer number (20459331).

Almost surely, 2^68197765 is an apocalyptic number.

It is an amenable number.

68197765 is a deficient number, since it is larger than the sum of its proper divisors (13639559).

68197765 is a wasteful number, since it uses less digits than its factorization.

68197765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13639558.

The product of its digits is 635040, while the sum is 49.

The square root of 68197765 is about 8258.1938097867. The cubic root of 68197765 is about 408.5608176652.

The spelling of 68197765 in words is "sixty-eight million, one hundred ninety-seven thousand, seven hundred sixty-five".