68945399 has 4 divisors (see below), whose sum is σ = 69241536. Its totient is φ = 68649264.

The previous prime is 68945377. The next prime is 68945411. The reversal of 68945399 is 99354986.

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

It is a cyclic number.

It is not a de Polignac number, because 68945399 - 2⁸ = 68945143 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 68945399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68905399) 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, 147719 + ... + 148184.

It is an arithmetic number, because the mean of its divisors is an integer number (17310384).

Almost surely, 2^68945399 is an apocalyptic number.

68945399 is a deficient number, since it is larger than the sum of its proper divisors (296137).

68945399 is a wasteful number, since it uses less digits than its factorization.

68945399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296136.

The product of its digits is 2099520, while the sum is 53.

The square root of 68945399 is about 8303.3366184926. The cubic root of 68945399 is about 410.0483762074.

The spelling of 68945399 in words is "sixty-eight million, nine hundred forty-five thousand, three hundred ninety-nine".