68686940 has 48 divisors (see below), whose sum is σ = 167977152. Its totient is φ = 23102976.

The previous prime is 68686939. The next prime is 68686949. The reversal of 68686940 is 4968686.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68686949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2792 + ... + 12048.

It is an arithmetic number, because the mean of its divisors is an integer number (3499524).

Almost surely, 2^68686940 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 68686940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83988576).

68686940 is an abundant number, since it is smaller than the sum of its proper divisors (99290212).

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

68686940 is a wasteful number, since it uses less digits than its factorization.

68686940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9326 (or 9324 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 68686940 is about 8287.7584424258. The cubic root of 68686940 is about 409.5353451085.

The spelling of 68686940 in words is "sixty-eight million, six hundred eighty-six thousand, nine hundred forty".