68143405 has 32 divisors (see below), whose sum is σ = 95529600. Its totient is φ = 46137600.

The previous prime is 68143403. The next prime is 68143447. The reversal of 68143405 is 50434186.

It is a happy number.

It is not a de Polignac number, because 68143405 - 2¹ = 68143403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68143403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63211 + ... + 64279.

It is an arithmetic number, because the mean of its divisors is an integer number (2985300).

Almost surely, 2^68143405 is an apocalyptic number.

It is an amenable number.

68143405 is a deficient number, since it is larger than the sum of its proper divisors (27386195).

68143405 is a wasteful number, since it uses less digits than its factorization.

68143405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 68143405 is about 8254.9018770667. The cubic root of 68143405 is about 408.4522350763.

The spelling of 68143405 in words is "sixty-eight million, one hundred forty-three thousand, four hundred five".