68639628381 has 8 divisors (see below), whose sum is σ = 92425638624. Its totient is φ = 45306685200.

The previous prime is 68639628353. The next prime is 68639628389. The reversal of 68639628381 is 18382693686.

It is a happy number.

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

It is not a de Polignac number, because 68639628381 - 2⁹ = 68639627869 is a prime.

It is a super-2 number, since 2×68639628381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68639628389) 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, 113266411 + ... + 113267016.

It is an arithmetic number, because the mean of its divisors is an integer number (11553204828).

Almost surely, 2^68639628381 is an apocalyptic number.

It is an amenable number.

68639628381 is a deficient number, since it is larger than the sum of its proper divisors (23786010243).

68639628381 is a wasteful number, since it uses less digits than its factorization.

68639628381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226533531.

The product of its digits is 17915904, while the sum is 60.

The spelling of 68639628381 in words is "sixty-eight billion, six hundred thirty-nine million, six hundred twenty-eight thousand, three hundred eighty-one".