68139744 has 24 divisors (see below), whose sum is σ = 178867080. Its totient is φ = 22713216.

The previous prime is 68139713. The next prime is 68139769. The reversal of 68139744 is 44793186.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 68139696 and 68139705.

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 in 3 ways as a sum of consecutive naturals, for example, 354799 + ... + 354990.

It is an arithmetic number, because the mean of its divisors is an integer number (7452795).

Almost surely, 2^68139744 is an apocalyptic number.

It is an amenable number.

68139744 is an abundant number, since it is smaller than the sum of its proper divisors (110727336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68139744 is a wasteful number, since it uses less digits than its factorization.

68139744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709802 (or 709794 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 68139744 is about 8254.6801270552. The cubic root of 68139744 is about 408.4449202554. Note that the first 3 decimals are identical.

The spelling of 68139744 in words is "sixty-eight million, one hundred thirty-nine thousand, seven hundred forty-four".