68988656 has 40 divisors (see below), whose sum is σ = 147298608. Its totient is φ = 31040000.

The previous prime is 68988653. The next prime is 68988697. The reversal of 68988656 is 65688986.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68988653) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 15836 + ... + 19716.

Almost surely, 2^68988656 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 68988656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73649304).

68988656 is an abundant number, since it is smaller than the sum of its proper divisors (78309952).

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

68988656 is a wasteful number, since it uses less digits than its factorization.

68988656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001 (or 3995 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 56.

The square root of 68988656 is about 8305.9410062918. The cubic root of 68988656 is about 410.1341143645.

The spelling of 68988656 in words is "sixty-eight million, nine hundred eighty-eight thousand, six hundred fifty-six".