268978979 has 4 divisors (see below), whose sum is σ = 274701984. Its totient is φ = 263255976.

The previous prime is 268978961. The next prime is 268978993. The reversal of 268978979 is 979879862.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268978979 is a prime.

It is a super-2 number, since 2×268978979² = 144699382287764882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268978579) 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, 2861432 + ... + 2861525.

It is an arithmetic number, because the mean of its divisors is an integer number (68675496).

Almost surely, 2^268978979 is an apocalyptic number.

268978979 is a deficient number, since it is larger than the sum of its proper divisors (5723005).

268978979 is an equidigital number, since it uses as much as digits as its factorization.

268978979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5723004.

The product of its digits is 27433728, while the sum is 65.

The square root of 268978979 is about 16400.5786178415. The cubic root of 268978979 is about 645.5146656407.

The spelling of 268978979 in words is "two hundred sixty-eight million, nine hundred seventy-eight thousand, nine hundred seventy-nine".