68279405 has 4 divisors (see below), whose sum is σ = 81935292. Its totient is φ = 54623520.

The previous prime is 68279401. The next prime is 68279413. The reversal of 68279405 is 50497286.

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 51868804 + 16410601 = 7202^2 + 4051^2 .

It is not a de Polignac number, because 68279405 - 2² = 68279401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68279401) 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 3 ways as a sum of consecutive naturals, for example, 6827936 + ... + 6827945.

It is an arithmetic number, because the mean of its divisors is an integer number (20483823).

Almost surely, 2^68279405 is an apocalyptic number.

It is an amenable number.

68279405 is a deficient number, since it is larger than the sum of its proper divisors (13655887).

68279405 is a wasteful number, since it uses less digits than its factorization.

68279405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13655886.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 68279405 is about 8263.1353008407. The cubic root of 68279405 is about 408.7237829482.

The spelling of 68279405 in words is "sixty-eight million, two hundred seventy-nine thousand, four hundred five".