68780491540 has 24 divisors (see below), whose sum is σ = 144463009320. Its totient is φ = 27507629568.

The previous prime is 68780491499. The next prime is 68780491561. The reversal of 68780491540 is 4519408786.

It can be written as a sum of positive squares in 4 ways, for example, as 179452816 + 68601038724 = 13396^2 + 261918^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160617 + ... + 404176.

It is an arithmetic number, because the mean of its divisors is an integer number (6019292055).

Almost surely, 2^68780491540 is an apocalyptic number.

It is an amenable number.

68780491540 is an abundant number, since it is smaller than the sum of its proper divisors (75682517780).

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

68780491540 is a wasteful number, since it uses less digits than its factorization.

68780491540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570891 (or 570889 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 68780491540 in words is "sixty-eight billion, seven hundred eighty million, four hundred ninety-one thousand, five hundred forty".