68568649 has 4 divisors (see below), whose sum is σ = 68741764. Its totient is φ = 68395536.

The previous prime is 68568631. The next prime is 68568653. The reversal of 68568649 is 94686586.

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 38975049 + 29593600 = 6243^2 + 5440^2 .

It is a cyclic number.

It is not a de Polignac number, because 68568649 - 2¹⁵ = 68535881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68568596 and 68568605.

It is not an unprimeable number, because it can be changed into a prime (68568349) 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, 85962 + ... + 86755.

It is an arithmetic number, because the mean of its divisors is an integer number (17185441).

Almost surely, 2^68568649 is an apocalyptic number.

It is an amenable number.

68568649 is a deficient number, since it is larger than the sum of its proper divisors (173115).

68568649 is a wasteful number, since it uses less digits than its factorization.

68568649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173114.

The product of its digits is 2488320, while the sum is 52.

The square root of 68568649 is about 8280.6188778376. The cubic root of 68568649 is about 409.3001127045.

The spelling of 68568649 in words is "sixty-eight million, five hundred sixty-eight thousand, six hundred forty-nine".