68215128 has 64 divisors (see below), whose sum is σ = 177208320. Its totient is φ = 21859200.

The previous prime is 68215061. The next prime is 68215139. The reversal of 68215128 is 82151286.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205923 + ... + 206253.

It is an arithmetic number, because the mean of its divisors is an integer number (2768880).

Almost surely, 2^68215128 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 68215128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88604160).

68215128 is an abundant number, since it is smaller than the sum of its proper divisors (108993192).

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

68215128 is a wasteful number, since it uses less digits than its factorization.

68215128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648 (or 644 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 68215128 is about 8259.2450018146. The cubic root of 68215128 is about 408.5954876163.

The spelling of 68215128 in words is "sixty-eight million, two hundred fifteen thousand, one hundred twenty-eight".