68642005 has 16 divisors (see below), whose sum is σ = 91010304. Its totient is φ = 49434880.

The previous prime is 68641999. The next prime is 68642009. The reversal of 68642005 is 50024686.

It is not a de Polignac number, because 68642005 - 2³ = 68641997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68642009) 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 15 ways as a sum of consecutive naturals, for example, 15601 + ... + 19510.

It is an arithmetic number, because the mean of its divisors is an integer number (5688144).

Almost surely, 2^68642005 is an apocalyptic number.

It is an amenable number.

68642005 is a deficient number, since it is larger than the sum of its proper divisors (22368299).

68642005 is a wasteful number, since it uses less digits than its factorization.

68642005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35156.

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

The square root of 68642005 is about 8285.0470728898. The cubic root of 68642005 is about 409.4460196115.

The spelling of 68642005 in words is "sixty-eight million, six hundred forty-two thousand, five".