68820821540 has 96 divisors (see below), whose sum is σ = 155753466624. Its totient is φ = 25449984000.

The previous prime is 68820821501. The next prime is 68820821561. The reversal of 68820821540 is 4512802886.

It is a junction number, because it is equal to n+sod(n) for n = 68820821491 and 68820821500.

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 31 ways as a sum of consecutive naturals, for example, 6224297 + ... + 6235343.

It is an arithmetic number, because the mean of its divisors is an integer number (1622431944).

Almost surely, 2^68820821540 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 68820821540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77876733312).

68820821540 is an abundant number, since it is smaller than the sum of its proper divisors (86932645084).

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

68820821540 is a wasteful number, since it uses less digits than its factorization.

68820821540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11397 (or 11395 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 44.

The spelling of 68820821540 in words is "sixty-eight billion, eight hundred twenty million, eight hundred twenty-one thousand, five hundred forty".