68663391 has 8 divisors (see below), whose sum is σ = 96936624. Its totient is φ = 43082880.

The previous prime is 68663383. The next prime is 68663393. The reversal of 68663391 is 19336686.

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

It is not a de Polignac number, because 68663391 - 2³ = 68663383 is a prime.

It is a super-2 number, since 2×68663391² = 9429322527237762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68663393) 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, 673120 + ... + 673221.

It is an arithmetic number, because the mean of its divisors is an integer number (12117078).

Almost surely, 2^68663391 is an apocalyptic number.

68663391 is a deficient number, since it is larger than the sum of its proper divisors (28273233).

68663391 is a wasteful number, since it uses less digits than its factorization.

68663391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346361.

The product of its digits is 139968, while the sum is 42.

The square root of 68663391 is about 8286.3376107904. The cubic root of 68663391 is about 409.4885373252.

The spelling of 68663391 in words is "sixty-eight million, six hundred sixty-three thousand, three hundred ninety-one".