68409 has 12 divisors (see below), whose sum is σ = 107952. Its totient is φ = 41400.

The previous prime is 68399. The next prime is 68437. The reversal of 68409 is 90486.

It is not a de Polignac number, because 68409 - 2⁷ = 68281 is a prime.

68409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (68449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 247 + ... + 444.

It is an arithmetic number, because the mean of its divisors is an integer number (8996).

2⁶⁸⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

68409 is a deficient number, since it is larger than the sum of its proper divisors (39543).

68409 is a wasteful number, since it uses less digits than its factorization.

68409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 68409 is about 261.5511422265. The cubic root of 68409 is about 40.8982206809.

The spelling of 68409 in words is "sixty-eight thousand, four hundred nine".