268189709 has 4 divisors (see below), whose sum is σ = 277437660. Its totient is φ = 258941760.

The previous prime is 268189697. The next prime is 268189723. The reversal of 268189709 is 907981862.

268189709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 219928900 + 48260809 = 14830^2 + 6947^2 .

It is a cyclic number.

It is not a de Polignac number, because 268189709 - 2¹⁶ = 268124173 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 (268189759) 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, 4623932 + ... + 4623989.

It is an arithmetic number, because the mean of its divisors is an integer number (69359415).

Almost surely, 2^268189709 is an apocalyptic number.

268189709 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

268189709 is a deficient number, since it is larger than the sum of its proper divisors (9247951).

268189709 is an equidigital number, since it uses as much as digits as its factorization.

268189709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9247950.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 268189709 is about 16376.4986795102. The cubic root of 268189709 is about 644.8826651937.

The spelling of 268189709 in words is "two hundred sixty-eight million, one hundred eighty-nine thousand, seven hundred nine".