68397739 has 4 divisors (see below), whose sum is σ = 71997640. Its totient is φ = 64797840.

The previous prime is 68397733. The next prime is 68397761. The reversal of 68397739 is 93779386.

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

It is a cyclic number.

It is not a de Polignac number, because 68397739 - 2³ = 68397731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68397731) by changing a digit.

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, 1799922 + ... + 1799959.

It is an arithmetic number, because the mean of its divisors is an integer number (17999410).

Almost surely, 2^68397739 is an apocalyptic number.

68397739 is a deficient number, since it is larger than the sum of its proper divisors (3599901).

68397739 is a wasteful number, since it uses less digits than its factorization.

68397739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3599900.

The product of its digits is 1714608, while the sum is 52.

The square root of 68397739 is about 8270.2925583077. The cubic root of 68397739 is about 408.9597643360.

The spelling of 68397739 in words is "sixty-eight million, three hundred ninety-seven thousand, seven hundred thirty-nine".