121788678 has 48 divisors (see below), whose sum is σ = 269277120. Its totient is φ = 36693360.

The previous prime is 121788659. The next prime is 121788707. The reversal of 121788678 is 876887121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164433 + ... + 165171.

It is an arithmetic number, because the mean of its divisors is an integer number (5609940).

Almost surely, 2^121788678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121788678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134638560).

121788678 is an abundant number, since it is smaller than the sum of its proper divisors (147488442).

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

121788678 is a wasteful number, since it uses less digits than its factorization.

121788678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993 (or 982 counting only the distinct ones).

The product of its digits is 301056, while the sum is 48.

The square root of 121788678 is about 11035.7907736600. The cubic root of 121788678 is about 495.6810378838.

The spelling of 121788678 in words is "one hundred twenty-one million, seven hundred eighty-eight thousand, six hundred seventy-eight".