68688840 has 128 divisors (see below), whose sum is σ = 238101120. Its totient is φ = 15667200.

The previous prime is 68688827. The next prime is 68688853. The reversal of 68688840 is 4888686.

It is an interprime number because it is at equal distance from previous prime (68688827) and next prime (68688853).

It is a self number, because there is not a number n which added to its sum of digits gives 68688840.

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, 20910 + ... + 23970.

It is an arithmetic number, because the mean of its divisors is an integer number (1860165).

Almost surely, 2^68688840 is an apocalyptic number.

68688840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68688840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119050560).

68688840 is an abundant number, since it is smaller than the sum of its proper divisors (169412280).

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

68688840 is a wasteful number, since it uses less digits than its factorization.

68688840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103 (or 3099 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 48.

The square root of 68688840 is about 8287.8730685261. The cubic root of 68688840 is about 409.5391212265.

The spelling of 68688840 in words is "sixty-eight million, six hundred eighty-eight thousand, eight hundred forty".