68807778 has 64 divisors (see below), whose sum is σ = 161481600. Its totient is φ = 19353600.

The previous prime is 68807777. The next prime is 68807821. The reversal of 68807778 is 87770886.

It is a self number, because there is not a number n which added to its sum of digits gives 68807778.

It is not an unprimeable number, because it can be changed into a prime (68807777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42178 + ... + 43778.

It is an arithmetic number, because the mean of its divisors is an integer number (2523150).

Almost surely, 2^68807778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68807778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80740800).

68807778 is an abundant number, since it is smaller than the sum of its proper divisors (92673822).

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

68807778 is a wasteful number, since it uses less digits than its factorization.

68807778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667.

The product of its (nonzero) digits is 1053696, while the sum is 51.

The square root of 68807778 is about 8295.0453886642. The cubic root of 68807778 is about 409.7753637592.

The spelling of 68807778 in words is "sixty-eight million, eight hundred seven thousand, seven hundred seventy-eight".