68399993 has 8 divisors (see below), whose sum is σ = 73965312. Its totient is φ = 63006016.

The previous prime is 68399983. The next prime is 68400001. The reversal of 68399993 is 39999386.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68399993 - 2¹² = 68395897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68399983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42005 + ... + 43602.

It is an arithmetic number, because the mean of its divisors is an integer number (9245664).

Almost surely, 2^68399993 is an apocalyptic number.

It is an amenable number.

68399993 is a deficient number, since it is larger than the sum of its proper divisors (5565319).

68399993 is a wasteful number, since it uses less digits than its factorization.

68399993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85671.

The product of its digits is 2834352, while the sum is 56.

The square root of 68399993 is about 8270.4288280596. The cubic root of 68399993 is about 408.9642566150.

The spelling of 68399993 in words is "sixty-eight million, three hundred ninety-nine thousand, nine hundred ninety-three".