68628521136 has 320 divisors, whose sum is σ = 210843648000. Its totient is φ = 19224946944.

The previous prime is 68628521111. The next prime is 68628521173. The reversal of 68628521136 is 63112582686.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 287148505 + ... + 287148743.

It is an arithmetic number, because the mean of its divisors is an integer number (658886400).

Almost surely, 2^68628521136 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 68628521136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105421824000).

68628521136 is an abundant number, since it is smaller than the sum of its proper divisors (142215126864).

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

68628521136 is a wasteful number, since it uses less digits than its factorization.

68628521136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541 (or 521 counting only the distinct ones).

The product of its digits is 829440, while the sum is 48.

The spelling of 68628521136 in words is "sixty-eight billion, six hundred twenty-eight million, five hundred twenty-one thousand, one hundred thirty-six".