68517888 has 128 divisors (see below), whose sum is σ = 198177840. Its totient is φ = 20971520.

The previous prime is 68517887. The next prime is 68517893. The reversal of 68517888 is 88871586.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 68517888.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68517887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1671148 + ... + 1671188.

Almost surely, 2^68517888 is an apocalyptic number.

68517888 is a gapful number since it is divisible by the number (68) 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 68517888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99088920).

68517888 is an abundant number, since it is smaller than the sum of its proper divisors (129659952).

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

68517888 is an equidigital number, since it uses as much as digits as its factorization.

68517888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 63 counting only the distinct ones).

The product of its digits is 860160, while the sum is 51.

The square root of 68517888 is about 8277.5532616831. The cubic root of 68517888 is about 409.1990868842.

The spelling of 68517888 in words is "sixty-eight million, five hundred seventeen thousand, eight hundred eighty-eight".