68999993 has 4 divisors (see below), whose sum is σ = 70604688. Its totient is φ = 67395300.

The previous prime is 68999981. The next prime is 69000047. The reversal of 68999993 is 39999986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68999993 - 2⁸ = 68999737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68999093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 802283 + ... + 802368.

It is an arithmetic number, because the mean of its divisors is an integer number (17651172).

Almost surely, 2^68999993 is an apocalyptic number.

It is an amenable number.

68999993 is a deficient number, since it is larger than the sum of its proper divisors (1604695).

68999993 is a wasteful number, since it uses less digits than its factorization.

68999993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604694.

The product of its digits is 8503056, while the sum is 62.

The square root of 68999993 is about 8306.6234415676. The cubic root of 68999993 is about 410.1565791002.

The spelling of 68999993 in words is "sixty-eight million, nine hundred ninety-nine thousand, nine hundred ninety-three".