268409786 has 4 divisors (see below), whose sum is σ = 402614682. Its totient is φ = 134204892.

The previous prime is 268409783. The next prime is 268409797. The reversal of 268409786 is 687904862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 687904862 = 2 ⋅343952431.

It can be written as a sum of positive squares in only one way, i.e., 189750625 + 78659161 = 13775^2 + 8869^2 .

It is not an unprimeable number, because it can be changed into a prime (268409783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67102445 + ... + 67102448.

Almost surely, 2^268409786 is an apocalyptic number.

268409786 is a deficient number, since it is larger than the sum of its proper divisors (134204896).

268409786 is a wasteful number, since it uses less digits than its factorization.

268409786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134204895.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 268409786 is about 16383.2165950402. The cubic root of 268409786 is about 645.0590142906.

The spelling of 268409786 in words is "two hundred sixty-eight million, four hundred nine thousand, seven hundred eighty-six".