68639857486704 has 720 divisors, whose sum is σ = 239859521341440. Its totient is φ = 18927273576960.

The previous prime is 68639857486703. The next prime is 68639857486741. The reversal of 68639857486704 is 40768475893686.

68639857486704 is a `hidden beast` number, since 6 + 8 + 6 + 39 + 8 + 574 + 8 + 6 + 7 + 0 + 4 = 666.

It is a super-2 number, since 2×68639857486704² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68639857486703) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2202874677 + ... + 2202905835.

Almost surely, 2^{68639857486704} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68639857486704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119929760670720).

68639857486704 is an abundant number, since it is smaller than the sum of its proper divisors (171219663854736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68639857486704 is a wasteful number, since it uses less digits than its factorization.

68639857486704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31600 (or 31575 counting only the distinct ones).

The product of its (nonzero) digits is 11705057280, while the sum is 81.

The spelling of 68639857486704 in words is "sixty-eight trillion, six hundred thirty-nine billion, eight hundred fifty-seven million, four hundred eighty-six thousand, seven hundred four".