68278979 has 4 divisors (see below), whose sum is σ = 68982984. Its totient is φ = 67574976.

The previous prime is 68278939. The next prime is 68278993. The reversal of 68278979 is 97987286.

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 68278979 - 2¹² = 68274883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68278939) 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, 351857 + ... + 352050.

It is an arithmetic number, because the mean of its divisors is an integer number (17245746).

Almost surely, 2^68278979 is an apocalyptic number.

68278979 is a deficient number, since it is larger than the sum of its proper divisors (704005).

68278979 is an equidigital number, since it uses as much as digits as its factorization.

68278979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704004.

The product of its digits is 3048192, while the sum is 56.

The square root of 68278979 is about 8263.1095236600. The cubic root of 68278979 is about 408.7229329276.

The spelling of 68278979 in words is "sixty-eight million, two hundred seventy-eight thousand, nine hundred seventy-nine".