68688906 has 64 divisors (see below), whose sum is σ = 162570240. Its totient is φ = 19074240.

The previous prime is 68688883. The next prime is 68688929. The reversal of 68688906 is 60988686.

It is an interprime number because it is at equal distance from previous prime (68688883) and next prime (68688929).

It is a Curzon number.

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, 191155 + ... + 191513.

It is an arithmetic number, because the mean of its divisors is an integer number (2540160).

Almost surely, 2^68688906 is an apocalyptic number.

68688906 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 68688906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81285120).

68688906 is an abundant number, since it is smaller than the sum of its proper divisors (93881334).

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

68688906 is a wasteful number, since it uses less digits than its factorization.

68688906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611.

The product of its (nonzero) digits is 995328, while the sum is 51.

The square root of 68688906 is about 8287.8770502463. The cubic root of 68688906 is about 409.5392523957.

The spelling of 68688906 in words is "sixty-eight million, six hundred eighty-eight thousand, nine hundred six".