68428734440 has 128 divisors (see below), whose sum is σ = 172231557120. Its totient is φ = 24254880000.

The previous prime is 68428734383. The next prime is 68428734469. The reversal of 68428734440 is 4443782486.

It is a super-2 number, since 2×68428734440² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5184089 + ... + 5197271.

It is an arithmetic number, because the mean of its divisors is an integer number (1345559040).

Almost surely, 2^68428734440 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 68428734440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86115778560).

68428734440 is an abundant number, since it is smaller than the sum of its proper divisors (103802822680).

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

68428734440 is a wasteful number, since it uses less digits than its factorization.

68428734440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13503 (or 13499 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 50.

The spelling of 68428734440 in words is "sixty-eight billion, four hundred twenty-eight million, seven hundred thirty-four thousand, four hundred forty".