68531393 has 4 divisors (see below), whose sum is σ = 78321600. Its totient is φ = 58741188.

The previous prime is 68531389. The next prime is 68531399. The reversal of 68531393 is 39313586.

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 68531393 - 2² = 68531389 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68531399) 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, 4895093 + ... + 4895106.

It is an arithmetic number, because the mean of its divisors is an integer number (19580400).

Almost surely, 2^68531393 is an apocalyptic number.

It is an amenable number.

68531393 is a deficient number, since it is larger than the sum of its proper divisors (9790207).

68531393 is an equidigital number, since it uses as much as digits as its factorization.

68531393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9790206.

The product of its digits is 58320, while the sum is 38.

The square root of 68531393 is about 8278.3689818708. The cubic root of 68531393 is about 409.2259697455.

The spelling of 68531393 in words is "sixty-eight million, five hundred thirty-one thousand, three hundred ninety-three".