68805405 has 12 divisors (see below), whose sum is σ = 119262780. Its totient is φ = 36696192.

The previous prime is 68805383. The next prime is 68805413. The reversal of 68805405 is 50450886.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 48066489 + 20738916 = 6933^2 + 4554^2 .

It is not a de Polignac number, because 68805405 - 2¹³ = 68797213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68805405.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 764460 + ... + 764549.

It is an arithmetic number, because the mean of its divisors is an integer number (9938565).

Almost surely, 2^68805405 is an apocalyptic number.

It is an amenable number.

68805405 is a deficient number, since it is larger than the sum of its proper divisors (50457375).

68805405 is a wasteful number, since it uses less digits than its factorization.

68805405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529020 (or 1529017 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 68805405 is about 8294.9023502390. The cubic root of 68805405 is about 409.7706530121.

The spelling of 68805405 in words is "sixty-eight million, eight hundred five thousand, four hundred five".