68405 has 4 divisors (see below), whose sum is σ = 82092. Its totient is φ = 54720.

The previous prime is 68399. The next prime is 68437. The reversal of 68405 is 50486.

68405 = 150² + 151² + 152².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50486 = 2 ⋅25243.

It can be written as a sum of positive squares in 2 ways, for example, as 47089 + 21316 = 217^2 + 146^2 .

It is not a de Polignac number, because 68405 - 2⁴ = 68389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6836 + ... + 6845.

It is an arithmetic number, because the mean of its divisors is an integer number (20523).

2⁶⁸⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

68405 is a deficient number, since it is larger than the sum of its proper divisors (13687).

68405 is a wasteful number, since it uses less digits than its factorization.

68405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13686.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 68405 is about 261.5434954267. The cubic root of 68405 is about 40.8974235340.

The spelling of 68405 in words is "sixty-eight thousand, four hundred five".