68781845 has 24 divisors (see below), whose sum is σ = 94687488. Its totient is φ = 47838560.

The previous prime is 68781793. The next prime is 68781871. The reversal of 68781845 is 54818786.

It is a happy number.

It is not a de Polignac number, because 68781845 - 2⁸ = 68781589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 68781845.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 11444 + ... + 16386.

It is an arithmetic number, because the mean of its divisors is an integer number (3945312).

Almost surely, 2^68781845 is an apocalyptic number.

It is an amenable number.

68781845 is a deficient number, since it is larger than the sum of its proper divisors (25905643).

68781845 is a wasteful number, since it uses less digits than its factorization.

68781845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993 (or 4982 counting only the distinct ones).

The product of its digits is 430080, while the sum is 47.

The square root of 68781845 is about 8293.4820793199. The cubic root of 68781845 is about 409.7238771389.

The spelling of 68781845 in words is "sixty-eight million, seven hundred eighty-one thousand, eight hundred forty-five".