68778720 has 288 divisors, whose sum is σ = 255921120. Its totient is φ = 17418240.

The previous prime is 68778713. The next prime is 68778737. The reversal of 68778720 is 2787786.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1127490 + ... + 1127550.

It is an arithmetic number, because the mean of its divisors is an integer number (888615).

Almost surely, 2^68778720 is an apocalyptic number.

68778720 is a gapful number since it is divisible by the number (60) 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 68778720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127960560).

68778720 is an abundant number, since it is smaller than the sum of its proper divisors (187142400).

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

68778720 is a wasteful number, since it uses less digits than its factorization.

68778720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The square root of 68778720 is about 8293.2936762182. The cubic root of 68778720 is about 409.7176719816.

The spelling of 68778720 in words is "sixty-eight million, seven hundred seventy-eight thousand, seven hundred twenty".