68308733 has 4 divisors (see below), whose sum is σ = 68325408. Its totient is φ = 68292060.

The previous prime is 68308729. The next prime is 68308741. The reversal of 68308733 is 33780386.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 68308733 - 2² = 68308729 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 (68308783) 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, 2528 + ... + 11958.

It is an arithmetic number, because the mean of its divisors is an integer number (17081352).

Almost surely, 2^68308733 is an apocalyptic number.

It is an amenable number.

68308733 is a deficient number, since it is larger than the sum of its proper divisors (16675).

68308733 is an equidigital number, since it uses as much as digits as its factorization.

68308733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16674.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 68308733 is about 8264.9097393740. The cubic root of 68308733 is about 408.7822941750.

The spelling of 68308733 in words is "sixty-eight million, three hundred eight thousand, seven hundred thirty-three".