68774561 has 4 divisors (see below), whose sum is σ = 68792724. Its totient is φ = 68756400.

The previous prime is 68774557. The next prime is 68774579. The reversal of 68774561 is 16547786.

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 36784225 + 31990336 = 6065^2 + 5656^2 .

It is a cyclic number.

It is not a de Polignac number, because 68774561 - 2² = 68774557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68774521) 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, 1010 + ... + 11771.

It is an arithmetic number, because the mean of its divisors is an integer number (17198181).

Almost surely, 2^68774561 is an apocalyptic number.

It is an amenable number.

68774561 is a deficient number, since it is larger than the sum of its proper divisors (18163).

68774561 is a wasteful number, since it uses less digits than its factorization.

68774561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18162.

The product of its digits is 282240, while the sum is 44.

The square root of 68774561 is about 8293.0429276593. The cubic root of 68774561 is about 409.7094133702.

The spelling of 68774561 in words is "sixty-eight million, seven hundred seventy-four thousand, five hundred sixty-one".