68821000640 has 112 divisors (see below), whose sum is σ = 187362340032. Its totient is φ = 23586840576.

The previous prime is 68821000627. The next prime is 68821000673. The reversal of 68821000640 is 4600012886.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 68821000640.

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, 9083894 + ... + 9091466.

It is an arithmetic number, because the mean of its divisors is an integer number (1672878036).

Almost surely, 2^68821000640 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 68821000640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93681170016).

68821000640 is an abundant number, since it is smaller than the sum of its proper divisors (118541339392).

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

68821000640 is a wasteful number, since it uses less digits than its factorization.

68821000640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11654 (or 11644 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The spelling of 68821000640 in words is "sixty-eight billion, eight hundred twenty-one million, six hundred forty", and thus it is an aban number.