68731739 has 4 divisors (see below), whose sum is σ = 69088056. Its totient is φ = 68375424.

The previous prime is 68731717. The next prime is 68731753. The reversal of 68731739 is 93713786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93713786 = 2 ⋅46856893.

It is a cyclic number.

It is not a de Polignac number, because 68731739 - 2¹² = 68727643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68731739.

It is not an unprimeable number, because it can be changed into a prime (68731709) 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, 177869 + ... + 178254.

It is an arithmetic number, because the mean of its divisors is an integer number (17272014).

Almost surely, 2^68731739 is an apocalyptic number.

68731739 is a deficient number, since it is larger than the sum of its proper divisors (356317).

68731739 is a wasteful number, since it uses less digits than its factorization.

68731739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356316.

The product of its digits is 190512, while the sum is 44.

The square root of 68731739 is about 8290.4607230238. The cubic root of 68731739 is about 409.6243614807.

The spelling of 68731739 in words is "sixty-eight million, seven hundred thirty-one thousand, seven hundred thirty-nine".