268649 has 4 divisors (see below), whose sum is σ = 270036. Its totient is φ = 267264.

The previous prime is 268643. The next prime is 268661. The reversal of 268649 is 946862.

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 133225 + 135424 = 365^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 268649 - 2¹² = 264553 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (268643) 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, 344 + ... + 809.

It is an arithmetic number, because the mean of its divisors is an integer number (67509).

2²⁶⁸⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

268649 is a deficient number, since it is larger than the sum of its proper divisors (1387).

268649 is a wasteful number, since it uses less digits than its factorization.

268649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386.

The product of its digits is 20736, while the sum is 35.

The square root of 268649 is about 518.3136116291. The cubic root of 268649 is about 64.5250588688.

The spelling of 268649 in words is "two hundred sixty-eight thousand, six hundred forty-nine".