68509645 has 8 divisors (see below), whose sum is σ = 83059704. Its totient is φ = 54242304.

The previous prime is 68509633. The next prime is 68509667. The reversal of 68509645 is 54690586.

It can be written as a sum of positive squares in 4 ways, for example, as 249001 + 68260644 = 499^2 + 8262^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68509645 - 2⁷ = 68509517 is a prime.

It is a super-3 number, since 3×68509645³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70144 + ... + 71113.

It is an arithmetic number, because the mean of its divisors is an integer number (10382463).

Almost surely, 2^68509645 is an apocalyptic number.

It is an amenable number.

68509645 is a deficient number, since it is larger than the sum of its proper divisors (14550059).

68509645 is a wasteful number, since it uses less digits than its factorization.

68509645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141359.

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 68509645 is about 8277.0553338733. The cubic root of 68509645 is about 409.1826767494.

The spelling of 68509645 in words is "sixty-eight million, five hundred nine thousand, six hundred forty-five".