68181905 has 8 divisors (see below), whose sum is σ = 89256384. Its totient is φ = 49586800.

The previous prime is 68181887. The next prime is 68181923. The reversal of 68181905 is 50918186.

It is an interprime number because it is at equal distance from previous prime (68181887) and next prime (68181923).

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

It is not a de Polignac number, because 68181905 - 2⁸ = 68181649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 619781 + ... + 619890.

It is an arithmetic number, because the mean of its divisors is an integer number (11157048).

Almost surely, 2^68181905 is an apocalyptic number.

It is an amenable number.

68181905 is a deficient number, since it is larger than the sum of its proper divisors (21074479).

68181905 is a wasteful number, since it uses less digits than its factorization.

68181905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239687.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 68181905 is about 8257.2334955480. The cubic root of 68181905 is about 408.5291437194.

The spelling of 68181905 in words is "sixty-eight million, one hundred eighty-one thousand, nine hundred five".