68139373 has 4 divisors (see below), whose sum is σ = 68240700. Its totient is φ = 68038048.

The previous prime is 68139371. The next prime is 68139389. The reversal of 68139373 is 37393186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37393186 = 2 ⋅18696593.

It can be written as a sum of positive squares in 2 ways, for example, as 62441604 + 5697769 = 7902^2 + 2387^2 .

It is a cyclic number.

It is not a de Polignac number, because 68139373 - 2¹ = 68139371 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68139371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49648 + ... + 51001.

It is an arithmetic number, because the mean of its divisors is an integer number (17060175).

Almost surely, 2^68139373 is an apocalyptic number.

It is an amenable number.

68139373 is a deficient number, since it is larger than the sum of its proper divisors (101327).

68139373 is a wasteful number, since it uses less digits than its factorization.

68139373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101326.

The product of its digits is 81648, while the sum is 40.

The square root of 68139373 is about 8254.6576549243. The cubic root of 68139373 is about 408.4441789683. Note that the first 3 decimals are identical.

The spelling of 68139373 in words is "sixty-eight million, one hundred thirty-nine thousand, three hundred seventy-three".