68781806 has 4 divisors (see below), whose sum is σ = 103172712. Its totient is φ = 34390902.

The previous prime is 68781793. The next prime is 68781871. The reversal of 68781806 is 60818786.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17195450 + ... + 17195453.

It is an arithmetic number, because the mean of its divisors is an integer number (25793178).

Almost surely, 2^68781806 is an apocalyptic number.

68781806 is a deficient number, since it is larger than the sum of its proper divisors (34390906).

68781806 is a wasteful number, since it uses less digits than its factorization.

68781806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34390905.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 68781806 is about 8293.4797280755. The cubic root of 68781806 is about 409.7237996997.

The spelling of 68781806 in words is "sixty-eight million, seven hundred eighty-one thousand, eight hundred six".