68444645 has 4 divisors (see below), whose sum is σ = 82133580. Its totient is φ = 54755712.

The previous prime is 68444627. The next prime is 68444647. The reversal of 68444645 is 54644486.

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 24275329 + 44169316 = 4927^2 + 6646^2 .

It is a cyclic number.

It is not a de Polignac number, because 68444645 - 2¹⁰ = 68443621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68444647) 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, 6844460 + ... + 6844469.

It is an arithmetic number, because the mean of its divisors is an integer number (20533395).

Almost surely, 2^68444645 is an apocalyptic number.

It is an amenable number.

68444645 is a deficient number, since it is larger than the sum of its proper divisors (13688935).

68444645 is a wasteful number, since it uses less digits than its factorization.

68444645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13688934.

The product of its digits is 368640, while the sum is 41.

The square root of 68444645 is about 8273.1278849054. The cubic root of 68444645 is about 409.0532288452.

The spelling of 68444645 in words is "sixty-eight million, four hundred forty-four thousand, six hundred forty-five".