68731405 has 4 divisors (see below), whose sum is σ = 82477692. Its totient is φ = 54985120.

The previous prime is 68731349. The next prime is 68731423. The reversal of 68731405 is 50413786.

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 17623204 + 51108201 = 4198^2 + 7149^2 .

It is not a de Polignac number, because 68731405 - 2⁷ = 68731277 is a prime.

It is a Duffinian 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, 6873136 + ... + 6873145.

It is an arithmetic number, because the mean of its divisors is an integer number (20619423).

Almost surely, 2^68731405 is an apocalyptic number.

It is an amenable number.

68731405 is a deficient number, since it is larger than the sum of its proper divisors (13746287).

68731405 is a wasteful number, since it uses less digits than its factorization.

68731405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13746286.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 68731405 is about 8290.4405793661. The cubic root of 68731405 is about 409.6236979602.

The spelling of 68731405 in words is "sixty-eight million, seven hundred thirty-one thousand, four hundred five".