68881618 has 8 divisors (see below), whose sum is σ = 111270348. Its totient is φ = 31791504.

The previous prime is 68881613. The next prime is 68881633. The reversal of 68881618 is 81618886.

It can be written as a sum of positive squares in 2 ways, for example, as 68608089 + 273529 = 8283^2 + 523^2 .

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

It is not an unprimeable number, because it can be changed into a prime (68881613) 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, 1324621 + ... + 1324672.

Almost surely, 2^68881618 is an apocalyptic number.

68881618 is a deficient number, since it is larger than the sum of its proper divisors (42388730).

68881618 is a wasteful number, since it uses less digits than its factorization.

68881618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2649308.

The product of its digits is 147456, while the sum is 46.

The square root of 68881618 is about 8299.4950448807. The cubic root of 68881618 is about 409.9218927158.

The spelling of 68881618 in words is "sixty-eight million, eight hundred eighty-one thousand, six hundred eighteen".