268388906 has 4 divisors (see below), whose sum is σ = 402583362. Its totient is φ = 134194452.

The previous prime is 268388903. The next prime is 268388933. The reversal of 268388906 is 609883862.

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

It can be written as a sum of positive squares in only one way, i.e., 267159025 + 1229881 = 16345^2 + 1109^2 .

It is not an unprimeable number, because it can be changed into a prime (268388903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67097225 + ... + 67097228.

Almost surely, 2^268388906 is an apocalyptic number.

268388906 is a deficient number, since it is larger than the sum of its proper divisors (134194456).

268388906 is a wasteful number, since it uses less digits than its factorization.

268388906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134194455.

The product of its (nonzero) digits is 995328, while the sum is 50.

The square root of 268388906 is about 16382.5793451459. The cubic root of 268388906 is about 645.0422871540.

The spelling of 268388906 in words is "two hundred sixty-eight million, three hundred eighty-eight thousand, nine hundred six".