68809079 has 4 divisors (see below), whose sum is σ = 69680160. Its totient is φ = 67938000.

The previous prime is 68809063. The next prime is 68809093. The reversal of 68809079 is 97090886.

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 68809079 - 2⁴ = 68809063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68809049) 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, 435422 + ... + 435579.

It is an arithmetic number, because the mean of its divisors is an integer number (17420040).

Almost surely, 2^68809079 is an apocalyptic number.

68809079 is a deficient number, since it is larger than the sum of its proper divisors (871081).

68809079 is an equidigital number, since it uses as much as digits as its factorization.

68809079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871080.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 68809079 is about 8295.1238085998. The cubic root of 68809079 is about 409.7779463858. Note that the first 3 decimals are identical.

The spelling of 68809079 in words is "sixty-eight million, eight hundred nine thousand, seventy-nine".