68320129 has 4 divisors (see below), whose sum is σ = 68470084. Its totient is φ = 68170176.

The previous prime is 68320117. The next prime is 68320141. The reversal of 68320129 is 92102386.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (68320117) and next prime (68320141).

It can be written as a sum of positive squares in 2 ways, for example, as 35521600 + 32798529 = 5960^2 + 5727^2 .

It is a cyclic number.

It is not a de Polignac number, because 68320129 - 2²¹ = 66222977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68320129.

It is not an unprimeable number, because it can be changed into a prime (68320429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74292 + ... + 75205.

It is an arithmetic number, because the mean of its divisors is an integer number (17117521).

Almost surely, 2^68320129 is an apocalyptic number.

It is an amenable number.

68320129 is a deficient number, since it is larger than the sum of its proper divisors (149955).

68320129 is a wasteful number, since it uses less digits than its factorization.

68320129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149954.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 68320129 is about 8265.5991313395. The cubic root of 68320129 is about 408.8050254022.

The spelling of 68320129 in words is "sixty-eight million, three hundred twenty thousand, one hundred twenty-nine".