68128887726 has 16 divisors (see below), whose sum is σ = 151397528400. Its totient is φ = 22709629224.

The previous prime is 68128887721. The next prime is 68128887731. The reversal of 68128887726 is 62778882186.

It is an interprime number because it is at equal distance from previous prime (68128887721) and next prime (68128887731).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68128887721) 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, 630822981 + ... + 630823088.

It is an arithmetic number, because the mean of its divisors is an integer number (9462345525).

Almost surely, 2^68128887726 is an apocalyptic number.

68128887726 is an abundant number, since it is smaller than the sum of its proper divisors (83268640674).

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

68128887726 is a wasteful number, since it uses less digits than its factorization.

68128887726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261646080 (or 1261646074 counting only the distinct ones).

The product of its digits is 28901376, while the sum is 63.

The spelling of 68128887726 in words is "sixty-eight billion, one hundred twenty-eight million, eight hundred eighty-seven thousand, seven hundred twenty-six".