68609988 has 72 divisors (see below), whose sum is σ = 187561920. Its totient is φ = 21072960.

The previous prime is 68609953. The next prime is 68610001. The reversal of 68609988 is 88990686.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23953 + ... + 26663.

Almost surely, 2^68609988 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 68609988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93780960).

68609988 is an abundant number, since it is smaller than the sum of its proper divisors (118951932).

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

68609988 is a wasteful number, since it uses less digits than its factorization.

68609988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777 (or 2772 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The square root of 68609988 is about 8283.1146315864. The cubic root of 68609988 is about 409.3823497933.

The spelling of 68609988 in words is "sixty-eight million, six hundred nine thousand, nine hundred eighty-eight".