68393809 has 8 divisors (see below), whose sum is σ = 74748960. Its totient is φ = 62061600.

The previous prime is 68393807. The next prime is 68393887. The reversal of 68393809 is 90839386.

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 68393809 - 2¹ = 68393807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68393807) 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, 837 + ... + 11725.

It is an arithmetic number, because the mean of its divisors is an integer number (9343620).

Almost surely, 2^68393809 is an apocalyptic number.

It is an amenable number.

68393809 is a deficient number, since it is larger than the sum of its proper divisors (6355151).

68393809 is a wasteful number, since it uses less digits than its factorization.

68393809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11471.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 68393809 is about 8270.0549574957. The cubic root of 68393809 is about 408.9519315105.

It can be divided in two parts, 6839 and 3809, that added together give a cube (10648 = 22³).

The spelling of 68393809 in words is "sixty-eight million, three hundred ninety-three thousand, eight hundred nine".